Recorded in neither Old English nor Middle English. Perhaps a borrowing from Dutch or Low German, but this derivation is rather unlikely due to the presence of the words like sweyr and swier in some East Midlands dialects, which are derived from attested Old English and Middle English words and , respectively. Ultimately derived from Proto-Germanic *swēgraz ("husband's brother"), from Proto-Indo-European *swéḱuros ("husband's father").