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*Does some research*
https://www.allrecipes.com/article/why-are-red-onions-considered-red/
https://www.allrecipes.com/article/why-are-red-onions-considered-red/
Really, "red" is a catch-all term for a loose group of hues, including yellow, orange, pink and purple.
Red onions have also earned their "red" name because their purplish skins have historically been used to make reddish dyes.
Red onions have also earned their "red" name because their purplish skins have historically been used to make reddish dyes.