According to QCTimes.com they are not related.
Don Doxsie said, "Claude 'Butch' Harmon is originally from New York, but he has Quad-Cities ties and is one of the most famous Golf teachers ever. The information I found online lists his wife's name as Lillie. He is not, however, related to Brian Harman in any way.
https://qctimes.com/news/local/ask-the-times/ask-the-times-these-businesses-have-operated-at-1136-w-2nd/article_9086c61c-84ef-53cd-900a-665eed294b84.html
Their last names are actually spelled different. Harmon vs. Harman
Butch Harman is known as being a professional golfer from 1970 to 1971. He is best known for his achievements as a golfing instructor, and is famous for being the instructor to Tiger Woods from 1993 to 2004.
No they are not related
Brian Butch was born on 1984-12-22.
Brian Gusse goes by Butch.
Butch Hartman and Seth MacFarlane are friends and Butch did some voices in the early years of Family Guy. Dr. Hartman from Family Guy is named after Butch.
The cast of Bad Butch - 2011 includes: Brian Crocker as Texas Pete Michael Ezaz as Sgt. Willis Lennie Nowtaka as Mrs. McGill James Pinkman as Dirty Red Armand Shahidi as Butch McGill Ales Tempel as Detroit Lawrence Erik Torres as Ignacio Sanchez
Butch Lewis went by Butch.
Butch Maier goes by Butch.
Butch Miller goes by Bushwhacker Butch.
Butch Byrd is 6'.
I believe it is Butch@butchhartman.com.