What about Celtic people (i.e. the IRISH)? For the most part, natural red hair is reserved for Europeans, but not only Nordic Europeans.
True celts tend to be dark haired and dark eyed. The lighter celts are so because of mixing with anglo-saxons and danes. Ever heard of danelaw? The british isles were ruled by denmark for a long time. Vikings plundered the celtic lands just as they did the rest of europe.
“nordic” refers to a genetic type that, thanks to viking raping and pillaging, has become the predominant type of all whites. Nordic genes are not limited to scandinavia.