The name is derived from the Polish common noun król meaning ‘king’ and refers to a characteristic feature (e.g. feeling important, or king-like behaviour). In the case of dialectal meanings of the above-mentioned common noun (‘a groom; a rabbit’), it may refer to a characteristic feature. Alternatively, it may also be derived from the Old German given name Karl ‘Charles’ and refer to the connection with the father or another ancestor by that name. Variants: Krol, Kroll.