I Can't Help But Wonder

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Summary

This is basically a collection of questions I can't find the answers to, and I am hoping someone who knows will share in the comments.

Genre
Other
Author
Jenny
Status
Ongoing
Chapters
5
Rating
n/a
Age Rating
13+

Blood Types

Why are the blood types A/B/O? I know O was initially C, but not why it was relabeled. More specifically, I am wondering if there is any relation between blood type labeling and the Alpha/Beta/Omega system in werewolf stories, or is it just a coincidence?