MyButton.js

import React from 'react'

function MyButton({ children, ...rest }) {
  return (
    <button onClick={(e) => window.alert(e.currentTarget.name)} {...rest}>
      {children}
    </button>
  )
}

function App() {
  return (
    <div>
      <MyButton name="alerter">Alert</MyButton>
    </div>
  )
}

export default App