Weimar Etymology
Fragment of a discussion from User talk:Rua
Firstly, you listed Proto-Germanic words, but the name obviously did not exist yet in Proto-Germanic. Secondly, there is no such word as "mari". There are māri (“known, famous”) and māri (“tale, message”), but those have nothing to do with this name. Thirdly, even Wikipedia itself gives multiple explanations. The actual attested form is Wīmari, so that is what should be in the etymology.