I was going to try the 2 first, but after your answers, I totally failed.
I'll post the sets I thought:
Michelangelo : Renaissance artists (fail)
Nash : Mathematicians (fail)
Some others that could be nice:
Food: pepperoni, beef, cabbage, lettuce, carrot, cinnamon, basil,... (avoid tomato(e) and potato(e) if your team has mixed Brits and USians)
Ilands: Madagascar, Hawaii, Cuba, Easter, Japan,...
Politicians: Carter, Kennedy, Reagan, Blair, Tatcher, Miterrand, Lennin,...