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personnummer? Sounds very Scandinavian to me and quick googling doesn't yield anything particularly Turkish about that word?

In Turkish it is called "tc kimlik numarasi", that would translate to "Turkish Republic ID Number"

My guess is German (because of the historical links between Germany and Turkey).

The word exists in Swedish exactly like that and also is a very common word. Means "person number" or "person ID" basically.

No, personnummer does not mean anything in Turkish. It's TC Kimlik No.