I know the various Polish and Russian names from PGmc. *walh.
"southern foreigner" in -lo-/-olo- probably follow ordinary rules of
derivation from Proto-Proto-Slav. -al-.
http://en.wikipedia.org/wiki/Etymology_of_Vlach
I just want to be sure: Are we absolutely certain all Slavic forms
from Germanic *walh- are from exactly that form in -al- and not
something earlier (I'm thinking of the original -ol- in Celtic Volcae)?
Torsten