I know that there are both albanian and montenegrian Kuci (Kuqi). I have read that they were mainly albanian till the 18th century when more and more of them became serbophone. This was and still is an area of mixed populations. One example of serbians/montenegrins who became albanophone in the same area at the same time is the popoviqi tribe (former popovic- son of a priest. Lot of families changed etnicity and language changed names back in those days mainly because of intermarriages and local clanconflicts wich forced them to flee to areas inhabited with people who spoke the other language. Plain adopting I would say. These examples are relly numerous.