Where is the last name 'Harmon' from?

Question:

Where is the last name 'Harmon' from?

Best Answer - Chosen by Asker: Tom Harmon, Heisman trophy winner, University of Michigan 1940. He was from Gary, Indiana (a virtual neighbor of Michael Jackson) and ended up in LA.

OK, seriously...

Top Places of Origin for Harmon
Place of
Origin ...... # Harmon Immigrants to America
Ireland ...... 76
England ...... 30
Great Britain ...... 8
Scotland ...... 5
France ...... 4
Wales ...... 4

Hence, there is no single answer to your question. Your ancestors could have been from either the British Isles or the continent. You'll have to do the research and find your immigrant ancestor to find out for sure.