Change chances of picking a random string

I would like Anna to have 67% chance of being picked randomly, Bob to have a 30% change, and Tom to have a 3% chance. Is there a simpler way to do this?

This is what I have so far:

var nomes = ['Anna', 'Bob', 'Tom'];
var name = nomes[Math.ceil(Math.random() * (nomes.length - 1))];
console.log(name);