When Europe transitioned from various indigenous religions to Christianity, biblical names started to become common and older names became less favoured to various degrees. Did any particular names acquire a particularly unpopular status, similar to a naming taboo?

This is not directly related to your question, but I think is something you'd find relevant.

The most common swear word in Finnish is "perkele," equivalent to "damn" in English. However, the word most likely originated as the name of a pre-Christian deity. We have no accurate sources on indigenous Finnish mythology, so this particular spirit or deity survives only through profanity.