When I was young, I had a friend whose last name was pronounced “tah-HAH-check” and I would like to look him up on Facebook or the like, but I don’t know how he spelled it. It was a slavic name, with a lot of consonants and one or two vowels, like ‘tjazgik’ or something like that, but I haven’t clue what the actual spelling was.
I haven’t tried it with a “u”, I will give it a shot. I lost contact with him when I was seven or eight, so I really don’t ever remember seeing it spelled out. My brother agrees on the pronunciation though.
Most NHL announcers- and the player himself - pronounce it “ka-chuck” but that doesn’t mean it’s “originally” pronounced that way; he’s of Ukranian descent, though.
I think it would be hilarious if your friend turns out to be Keith Tkachuk.