Kulla (plural kullor) is an older dialectal name for an unmarried woman, used often in most region of Sweden in the vicinity of Dalarna, but in present time mostly used as a term for a woman from Dalarna ("dalkulla"). 
In the oldest known source from 1640, "kulla" is synonymous with "woman." An older, unmarried woman is referred to as "gammkulla", while a married woman is referred to as "käring". 
The male equivalent is "dalkarl" or "mas".