I was aware of the Spanish meaning which is the same, but the reason we picked it was more mundane. It was one of the few names my wife and I both liked a lot.
ALMA is also a radio telescope in Chile (the Atacama Large Millimeter Array), which is somewhat closer afield to what I do.
Anyway, I'm glad I went with Alma over Rocky, albeit for the wrong reasons (my daughter's name is Alma...)