Anglo-Saxon is not just Germanic it is very specific to medieval England since the Anglo-Saxons were just the proto-English. The Angles were never particularly relevant until their migration into Britain and their mainland counterparts were almost entirely absorbed by the ancestors to the Danes by the 700s. The term you are looking for is WASP, which stands for White Anglo-Saxon Protestant which does have more of a pan white meaning here in the US and does cross over into the assimilated Germans, Celts, and Latins since it's a term for a specific cultural grouping rather than an ethnic one.

If it seems like I'm getting weirdly annoyed about this that's cause I am. I like anthropology and history, clumping together people descended from every damned Germanic nation and calling them fucking Anglo-Saxons is absurd. By that logic Romanians, French, and Italians are all Castilian. Words have meaning and while that meaning may shift let's not misuse specific anthropologic and historical terms.