My own surname arrived in the area (Ireland) about 700 BC (It's a tribal name and some of them are very old). By King Arthur's time their name/tribal identity applied to a part of Britain now known by various forms of Essex and Wessex.
Arthur is reported to have traded their property to the Saxon invaders for military service.
Folks with my surname hightailed it to Brittany, then the upper reaches of the Rhone Valley. I found an expert in the Gallo languages who lived in one of the old ducal towns in that area and he reported to me that every conceivable spelling of the surname occurred there ~ that I'd found the last place they landed before getting bought out by the Bourbons, some of whom then used their surname when they moved to Scandinavia in the 1500s.
That's when somebody decided some chickeeboo with a lot of Sa'ami ancestry looked really good. Her daddy was the Vassa King ~ and I don't know if he was a Sa'ami but he did a 200+ mile cross country skiing journey to escape Danish assassins!
I suspect he was more Sa'ami than anything else.
What I learned most about doing the study was simple ~ Nobles traveled with an entourage otherwise they always ended up dead. So your surname could end up in some cultural venue you would not have imagined just because some ancestors job was to take along, or to actually be the noble doing the moving.
BTW, even the Vassa King had Bourbon ancestors through one of his Great Grandmothers ~ who arrived in Scandinavia in the late 1400s.