JSFiddle - React, Tailwind, and code Playground

HTML

<pre></pre>

JavaScript

var arr = [{
  level: 0,
  name: "greg"
}, {
  level: 0,
  name: "Math"
}, {
  level: 0,
  name: "greg"
}];

var res = $.map($.unique($.map(arr, el => el.name)), name => 
            $.grep(arr, el => el.name === name)[0]);

$("pre").text(JSON.stringify(res, null, 2));