There was a professional wrestler popular in Minnesota in the 1980s whose name was also Greg Gagne. He was born in Minnesota (son of Verne) but that family used the French pronunciation.

I have thought before about players whose last names are spelled the same but pronounced differently. I had a list in my head at one point but I can't recall it now. One that does come to mind is Franco, which rhymes with "bank"-o for many players but rhymes with "honk"-o for Julio Franco, even though few people ever correctly pronounced it.

Several years ago, when I hung out regularly in the Usenet newsgroup, rec.sport.baseball, someone asked if there had been any baseball players who had a last name that was spelled the same as that of another player but was pronounced differently. I came up with Jose Pagan (puh-GAHN), originally from Puerto Rico, and Dave Pagan (PAY-gan), originally from Saskatchewan, Canada. I remember that a T.V. baseball announcer, commenting on the lesser-known Dave Pagan's entry into a game, noted how his last name's pronunciation differed from that of the better-known Jose Pagan's last name and that both came from places in the Western Hemisphere that were not in the U.S. (Never mind the technicality that Puerto Rico is a U.S. territory.)

I also mentioned two players who passed through Washington, DC, and played their home games in RFK Stadium around the same time in the early 1970s: Washington Redskins special teams player/reserve running back Bob Brunet, a Louisianan whose last name was pronounced bru-NAY, and Washington Senators pitcher George Brunet, whose last name was pronounced bru-NET. Yes, George Brunet did move on to yet another team after his stint with the Los Angeles/California Angels.