Conversation so far:
what type of monkey is in the hangover part 2
Crystal the Monkey is a female capuchin monkey who portrayed a drug-dealing monkey in The Hangover Part II.
where is the capuchin monkey found
The range of capuchin monkeys includes some tropical forests in Central America and South America as far south as northern Argentina.

Question: where does the name come from
Self-contained rewrite: where does the name for capuchin monkeys come from