diff --git a/js/src/abi/spec/event/event.js b/js/src/abi/spec/event/event.js
index a17de1e64..025f2c316 100644
--- a/js/src/abi/spec/event/event.js
+++ b/js/src/abi/spec/event/event.js
@@ -23,12 +23,12 @@ import { eventSignature } from '../../util/signature';
 
 export default class Event {
   constructor (abi) {
-    this._name = abi.name;
     this._inputs = EventParam.toEventParams(abi.inputs || []);
     this._anonymous = !!abi.anonymous;
 
-    const { id, signature } = eventSignature(this._name, this.inputParamTypes());
+    const { id, name, signature } = eventSignature(abi.name, this.inputParamTypes());
     this._id = id;
+    this._name = name;
     this._signature = signature;
   }
 
diff --git a/js/src/abi/spec/function.js b/js/src/abi/spec/function.js
index 68a6ca342..04e059c47 100644
--- a/js/src/abi/spec/function.js
+++ b/js/src/abi/spec/function.js
@@ -22,14 +22,14 @@ import { methodSignature } from '../util/signature';
 export default class Func {
   constructor (abi) {
     this._abi = abi;
-    this._name = abi.name;
     this._constant = !!abi.constant;
     this._payable = abi.payable;
     this._inputs = Param.toParams(abi.inputs || []);
     this._outputs = Param.toParams(abi.outputs || []);
 
-    const { id, signature } = methodSignature(this._name, this.inputParamTypes());
+    const { id, name, signature } = methodSignature(abi.name, this.inputParamTypes());
     this._id = id;
+    this._name = name;
     this._signature = signature;
   }
 
diff --git a/js/src/abi/spec/function.spec.js b/js/src/abi/spec/function.spec.js
index 6ad755d70..af43958c9 100644
--- a/js/src/abi/spec/function.spec.js
+++ b/js/src/abi/spec/function.spec.js
@@ -35,6 +35,18 @@ describe('abi/spec/Function', () => {
   });
 
   describe('constructor', () => {
+    it('returns signature correctly if name already contains it', () => {
+      const func = new Func({
+        name: 'test(bool,string)',
+        inputs: inputsArr,
+        outputs: outputsArr
+      });
+
+      expect(func.name).to.equal('test');
+      expect(func.id).to.equal('test(bool,string)');
+      expect(func.signature).to.equal('02356205');
+    });
+
     it('stores the parameters as received', () => {
       expect(func.name).to.equal('test');
       expect(func.constant).to.be.false;
diff --git a/js/src/abi/util/signature.js b/js/src/abi/util/signature.js
index f192e576b..ad2b7ca5b 100644
--- a/js/src/abi/util/signature.js
+++ b/js/src/abi/util/signature.js
@@ -17,15 +17,31 @@
 import { keccak_256 } from 'js-sha3'; // eslint-disable-line camelcase
 import { fromParamType } from '../spec/paramType/format';
 
-export function eventSignature (name, params) {
+export function eventSignature (eventName, params) {
+  const { strName, name } = parseName(eventName);
   const types = (params || []).map(fromParamType).join(',');
-  const id = `${name || ''}(${types})`;
+  const id = `${strName}(${types})`;
 
-  return { id, signature: keccak_256(id) };
+  return { id, name, signature: keccak_256(id) };
 }
 
-export function methodSignature (name, params) {
-  const { id, signature } = eventSignature(name, params);
+export function methodSignature (methodName, params) {
+  const { id, name, signature } = eventSignature(methodName, params);
 
-  return { id, signature: signature.substr(0, 8) };
+  return { id, name, signature: signature.substr(0, 8) };
+}
+
+function parseName (name) {
+  const strName = `${name || ''}`;
+  const idx = strName.indexOf('(');
+
+  if (idx === -1) {
+    return { strName, name };
+  }
+
+  const trimmedName = strName.slice(0, idx);
+  return {
+    strName: trimmedName,
+    name: trimmedName
+  };
 }
diff --git a/js/src/abi/util/signature.spec.js b/js/src/abi/util/signature.spec.js
index 144c1c7aa..dfa81333f 100644
--- a/js/src/abi/util/signature.spec.js
+++ b/js/src/abi/util/signature.spec.js
@@ -19,50 +19,93 @@ import { eventSignature, methodSignature } from './signature';
 describe('abi/util/signature', () => {
   describe('eventSignature', () => {
     it('encodes signature baz() correctly', () => {
-      expect(eventSignature('baz', []))
-        .to.deep.equal({ id: 'baz()', signature: 'a7916fac4f538170f7cd12c148552e2cba9fcd72329a2dd5b07a6fa906488ddf' });
+      expect(eventSignature('baz', [])).to.deep.equal({
+        id: 'baz()',
+        name: 'baz',
+        signature: 'a7916fac4f538170f7cd12c148552e2cba9fcd72329a2dd5b07a6fa906488ddf'
+      });
     });
 
     it('encodes signature baz(uint32) correctly', () => {
-      expect(eventSignature('baz', [{ type: 'uint', length: 32 }]))
-        .to.deep.equal({ id: 'baz(uint32)', signature: '7d68785e8fc871be024b75964bd86d093511d4bc2dc7cf7bea32c48a0efaecb1' });
+      expect(eventSignature('baz', [{ type: 'uint', length: 32 }])).to.deep.equal({
+        id: 'baz(uint32)',
+        name: 'baz',
+        signature: '7d68785e8fc871be024b75964bd86d093511d4bc2dc7cf7bea32c48a0efaecb1'
+      });
     });
 
     it('encodes signature baz(uint32, bool) correctly', () => {
-      expect(eventSignature('baz', [{ type: 'uint', length: 32 }, { type: 'bool' }]))
-        .to.deep.equal({ id: 'baz(uint32,bool)', signature: 'cdcd77c0992ec5bbfc459984220f8c45084cc24d9b6efed1fae540db8de801d2' });
+      expect(eventSignature('baz', [{ type: 'uint', length: 32 }, { type: 'bool' }])).to.deep.equal({
+        id: 'baz(uint32,bool)',
+        name: 'baz',
+        signature: 'cdcd77c0992ec5bbfc459984220f8c45084cc24d9b6efed1fae540db8de801d2'
+      });
     });
 
     it('encodes no-name signature correctly as ()', () => {
-      expect(eventSignature(undefined, []))
-        .to.deep.equal({ id: '()', signature: '861731d50c3880a2ca1994d5ec287b94b2f4bd832a67d3e41c08177bdd5674fe' });
+      expect(eventSignature(undefined, [])).to.deep.equal({
+        id: '()',
+        name: undefined,
+        signature: '861731d50c3880a2ca1994d5ec287b94b2f4bd832a67d3e41c08177bdd5674fe'
+      });
     });
 
     it('encodes no-params signature correctly as ()', () => {
-      expect(eventSignature(undefined, undefined))
-        .to.deep.equal({ id: '()', signature: '861731d50c3880a2ca1994d5ec287b94b2f4bd832a67d3e41c08177bdd5674fe' });
+      expect(eventSignature(undefined, undefined)).to.deep.equal({
+        id: '()',
+        name: undefined,
+        signature: '861731d50c3880a2ca1994d5ec287b94b2f4bd832a67d3e41c08177bdd5674fe'
+      });
     });
   });
 
   describe('methodSignature', () => {
     it('encodes signature baz() correctly', () => {
-      expect(methodSignature('baz', [])).to.deep.equal({ id: 'baz()', signature: 'a7916fac' });
+      expect(methodSignature('baz', [])).to.deep.equal({
+        id: 'baz()',
+        name: 'baz',
+        signature: 'a7916fac'
+      });
     });
 
     it('encodes signature baz(uint32) correctly', () => {
-      expect(methodSignature('baz', [{ type: 'uint', length: 32 }])).to.deep.equal({ id: 'baz(uint32)', signature: '7d68785e' });
+      expect(methodSignature('baz', [{ type: 'uint', length: 32 }])).to.deep.equal({
+        id: 'baz(uint32)',
+        name: 'baz',
+        signature: '7d68785e'
+      });
     });
 
     it('encodes signature baz(uint32, bool) correctly', () => {
-      expect(methodSignature('baz', [{ type: 'uint', length: 32 }, { type: 'bool' }])).to.deep.equal({ id: 'baz(uint32,bool)', signature: 'cdcd77c0' });
+      expect(methodSignature('baz', [{ type: 'uint', length: 32 }, { type: 'bool' }])).to.deep.equal({
+        id: 'baz(uint32,bool)',
+        name: 'baz',
+        signature: 'cdcd77c0'
+      });
+    });
+
+    it('encodes signature in name correctly', () => {
+      expect(methodSignature('baz(uint32,bool)', [{ type: 'uint', length: 32 }, { type: 'bool' }])).to.deep.equal({
+        id: 'baz(uint32,bool)',
+        name: 'baz',
+        signature: 'cdcd77c0'
+      });
     });
 
     it('encodes no-name signature correctly as ()', () => {
-      expect(methodSignature(undefined, [])).to.deep.equal({ id: '()', signature: '861731d5' });
+      expect(methodSignature(undefined, [])).to.deep.equal({
+        id: '()',
+        name: undefined,
+        signature: '861731d5'
+      });
     });
 
     it('encodes no-params signature correctly as ()', () => {
-      expect(methodSignature(undefined, undefined)).to.deep.equal({ id: '()', signature: '861731d5' });
+      expect(methodSignature(undefined, undefined)).to.deep.equal({
+        id: '()',
+        name: undefined,
+        signature: '861731d5'
+      });
     });
   });
 });