Not a native Polish speaker, but a fluent speaker. Here is [name_f]Katarzyna[/name_f] + [name_f]Kasia[/name_f] for you
I don’t think you’re crazy! I’ve met three Kasias in my life - two in [name_f]England[/name_f], one in [name_f]Scotland[/name_f] - all named for Polish heritage. It’s a beautiful name
I will say, though I don’t think it’s an especially hard name to pronounce, others do seem to struggle with it even after meeting a [name_f]Kasia[/name_f] repeatedly (they usually go for kah-see-a or kay-see-a). It also depends which vintage names you’re wanting it to fit in with - [name_f]Kasia[/name_f] and [name_f]Vita[/name_f] could work, [name_f]Kasia[/name_f] and [name_f]Marigold[/name_f] not so much…
It really is difficult to write phonetically how it’s actually pronounced. That may contribute to my hesitation to actually use it.
I do like [name_f]Cassia[/name_f] a lot, too. And [name_f]Cassia[/name_f] [name_f]Maeve[/name_f] is lovely!