My wife has a brother named, “Chris”. I have a sister named, “Kris”. It can get confusing at times. I’m going to suggest we pronounce Kris’ name as “KA-ris” and Chris’ name as “CHA-ris” with emphasis placed on the capped letters. Then again, it may not be a good idea cuz I don’t want people calling me “ERRRR-ik”. Then again, maybe I do. No, no. I don’t. Or do it?
You could just go with Kah, Cha, and Air. I could be Mah. Your wife would be Ah.
Does it really get confusing enough that you need to call them something other than their name? I wouldn’t want to be called something different just because my friends/family couldn’t take the time to say “My brother Tom” or whatever qualifier is accurate
“My bonehead, Tom”.