What language does it attribute the meaning to? Then do a quick check in a dictionary of that language and see if they're close.
-son is an English and Scandinavian ending. If it says it's Old English or Anglo-Saxon I can tell you that Raw/Raew meant 'row' and Row- meant 'gentle, quiet'. 'Wolf' was 'wulf' as in Randolph rand + wulf.
In English surnames Rawson would mean 'son of (the) rough (one)'.
Devon