that means you are either yugoslavian or probably russian (maybe baltic) that "ich" thing (which is really not the same sound as the english ch at all, or the german, it's sorta like a hard "th" if anything) i understand it is a diminuitive suffix, idk what the logic behind it is a more common thing in ukraine and southern slavic countries is the "-in" ending in names, eg "doronin" "constantin" (and -ina of course) which is another variant of diminutive that is kinda feminine based on the old latin use of this suffix my guess is that it's like a fork in the family tree at a male or female? -ich being male, -in being male? just curious, i never did actually get told or read up on the logic of it, but i know that -ovich and -ovin are also somewhat common family names

I never thought about where this -ich in the father's name comes from 🤔 It would be logical to just write something like Ivan Ivan. Probably it's something like 's in Old Slavonic, but I'm not entirely sure.