I have recently located Golubic on my tree as well (from Sveti Martin pod Okic, Croatia). In looking at church records, it's clear that the spelling of this name wasn't "fixed" until the 1900s...I saw Golubic, Golobic, Golubich/obich, and Gollubic/ch as well. They are all the same family, though. I found out early on not to attach too much weight to the specific spelling of Eastern European names - just be diligent that it's the same family.
My Golubic is Barbara, daughter of Anton, married to Tomo Slamar (Szlamar, Szlammar) in Sv Martin.