There were plans that were carried out in that fashion. For instance, the Germans were infamous for separating Polish children from their families if the children looked German (ie the Aryan blond hair blue eyes) and give them to German families while there parents were worked to death through concentration camps and the planned enslavement of the Slavs, of which the Poles are a part.
That sounds like alot of Polish kids to me - blondism is even more prominent in Poland than Germany I think.
https://bigthink.com/strange-maps/214-the-blonde-map-of-europe