If someone's name is Cohen (also Katz, Rappaport, etc.), what is the chance that they are a Kohen?

Question

What percentage of each are really Kohanim? Also Levi, Levitan, Horowitz, etc. for Levites.

Answer 1

Cohen could easily be mistaken for Kohen back when a lot of people were illiterate and the person writing the name had to write what he heard.

Answer 2

Your question came through to the genealogy forum, but you are in breach of the yahoo guidelines because it isn't very clear.

Hope this helps.