okay, if it's from Sulkowski then the meaning is like this:
it is composed of
sulek and the suffix
-owski, the latter meaning "from, pertaining to". Sulek has the suffix
-ek meaning "little" so it's a diminutive and the
sul-part comes from the Slavic firstname Sulimir which is composed of
suli "promise" and
mir "peace". Thus, Sulkowski means "pertaining to Sulimir" and Sulimir means "promise and peace". Sulkowski basically means "one from the place of Sulimir" thus "one from Sulkow". There are four placenames similar to Sulkow, namely Sulkowice, Sulkowo, Sulkowo Bariany and Sulkowo Rzeczne.
http://www.ancestry.com/learn/facts/Fact.aspx?fid=10&yr=0&ln=Sulek