It's not only linguistic drift, it's about awareness. Three used to be a beer narrow set of names (in western Europe) that got used, with a mostly Catholic base, so your John, Paul, Marie type names which would hear the variation of your country. Usually the ancestors would be reflected in the naming convention.

However awareness spreads through media like newspaper and film. Celebrity means that different spellings of names get noticed and get used, regardless of culture. There's Estonian men named James, because of James Dean (or Bond). There's kids named after fashion brands nowadays.

The boundary between appropriation and homage is thin. Is Willem Dafoes embracing his school nickname insensitive towards the Dutch? It can be cringey, like Shia Labeoufs mother making two spelling mistakes in her new french inspired last name. It's a bit time deaf maybe but I wouldn't personally classify it as inappropriate.

Ultimately culture works by drawing inspiration from others. Like Picasso being inspired by Cycladic sculpture and Renaissance artist by roman art.

All comes from PIE

Issues around "black hair" (I think is the most common word for it, but feel free to correct me if I'm wrong here) are certainly real and depressing.

I still don't think naming a child after a name you happen to like is so problematic (well, unless the name you like is something like 'Hitler' or will otherwise cause trauma and issues for the child). If using another culture's name is a bad kind of cultural appropriation, then either nearly everyone or almost no one is guilty of this (the former because people move and cultures merge and split, the latter being a reductionist take that all human genetics come from basically the same place and/or a "pre-world" language family).

I think cultural appropriation itself is a bit of a weird one. You have people like most Japanese who encourage people to wear kimono and other Japanese styles. I assume that's true in a lot of the world (I just happen to be more familiar with the Japanese side having lived here for about a decade). But is wearing clothing cultural appropriation? Is cosplay? My Japanese friends and wife encourage me to wear yukata and such, but I generally am just my jeans-and-tshirt self.

Speaking of, were all those Japanese around the Meiji restoration wearing suits appropriating Western culture. Is "Western culture" even a unified culture? Cultures have always borrowed, stolen, and shared. I think if something is intentionally done in mockery or some other way, it's not OK. Other than that, I think a lot of people are angry, often on behalf of others who may or may not actually be angry themselves.