The only colonised part are South and North parts of the country, vast majority of Bessarabia was inhibited mostly by Moldavians, plenty of them even came from right side of Prut river till 60's of 19th century when Russian stoped these migrations. In my ancestry tree practically all surnames are native (Roșca, Orbu, Rotaru, Ghemu, Chirică, Cīntărețu) except one, Butnarciuc, which seems to be slavicized, since in Ukraine he exist mostly between Moldavinas near Bug river in today Mykolaiv Oblast, the word Butnar is not Slavic in origin. In Moldova are plenty on people with surname Butnaru, and in Romania Moldova too.
Top 50 most popular surnames in the village of my father.
Top 50 most popular surnames in the village of my mother.