Aren't White Americans mostly just a mix of Celtic and Germanic?
Other options for the mutts: Celto-Germanic, Anglo-Celtic , Anglo-Norse, Nordic-Germanic, Norse-Gael, Italo-Celtic, etc.
"White" is why we are in the mess we're are in! This word has taken on religious connotations and has evolved into some secularized stand-in for universalized "christendom", where everyone is "equal in white" (including the lowest scum). The lowest leftist can self-identify as white and then take ownership of white, and all those they label white. They become the universal spokespersons and representatives of "all the whites" (including Europeans) to the ethnics, the judge of the behavior of other whites relative to their socially constructed commandments of white, and they can militate against white to signal their piety.
So, only identity with your ethnic sub-type and sue anyone who labels you white. Then if you ever apply to college or for a job and are forced to identify as white instead of your ethnic sub-type, sue them! In a time when people are being imprisoned and sued for misgendering someone or not using the correct pronouns, this is something that every ethnic European should pursue!
"White" is how you end up with wiggers, and people who hate themselves. What is their to be proud of when your entire identity and culture is built around a color descriptor?