Obviously this is for vanilla so please discount names added/changed in any mods you might play.
Originally mentioned here (or at least by me) but it was suggested a more general thread be opened to report these. The idea of this thread is to help the developers link up names which should be but currently aren't.
Please post the name in bold and the culture in (brackets) next to it so your suggestions are clear to see when reading this thread.
I'll start by suggesting that Lothaire (frankish) and Lothar (german) should be linked, as well as Clotaire (frankish) and Chlothar (german) although the latter name would need to be added.
There are also a couple of different spellings of Lothaire in frankish.txt (Lothair instead of Lothaire for example) so the numbering for Frankish kings can be incorrect.