Well,
Kai = Beautiful is a new one to this South African ... but we've got eleven official languages plus a few minor ones that didn't make the list, so I'll never say it's impossible.
However,
Kaia means a house in several of those languages; this sounds pleasant and harmless, but it is mostly used for either a really oldfashioned mud shack or a toilet; reason being that before sanitation really took off, people would have a separate little building for the toilet, away from the house, to keep the smell and the flies away.
The only South Africans called
Kai that I've ever known have been men of
German descent.