Name output by button

I have a div where the name should be displayed by pressing a button. The two buttons below, if you click on the first, the John name should appear, and if the second, Donald. Where is the mistake?

import React, { Component } from 'react';


class trueName extends Component {
  constructor(props) {
    this.state = {
      name: {},
    };
  }

  john = ()=>{
    const {name}= this.state;
    this.setState({name:"John"})
  }

  donald = ()=>{
    const {name}= this.state;
    this.setState({name:"Donald"})
  }

render() {
    return(
      <div >
        <div className="SelectName">
          <span>{this.name}</span>
        </div>

        <button
        className = "one"
        onClick={ this.john}>
          <span>My name John</span>
        </button>

        <button
        className = "two"
        onClick={ this.donald}
        >
          <span>My name Donald</span>
        </button>
      </div>

    )
  }
}

export default trueName;