> both pagan, both had runes and somesuch, built similar ships, so as to say they had more in common than the raiding.
No, they did not have runes. The runes were only used by various Germanic peoples. As far as I know the Baltic and Finnic pagans lacked a written language.
Also, surely you wouldn't call (now or then) Mediterranean-born pirates Vikings.
Perhaps but culturally it's more widely used as a term for scandivanians "pirates/invaders" of said era. It is a well known term. Hell, we even have a football team named in their honor.
> it wasn't only the Scandinavians that raided
Did anyone say it was only the scandinavians who raided? Pretty much everyone raided. But the Vikings were just the most successful of the bunch and hence historically significant enough to remember.
Everything before abrahamic religions is pagan or something more specific?