Coșeiu is located about 18 km from the county seat Zalău. The earliest document to mention it dates to 1345, where it is called Kusal. In 1432 Kwsal, 1450 Kwssal, 1505 Kwssaly, 1549 Kwsaly, 1591 Kusalj, Kussally, Kusaj and in 1805 it was written as Coseiu.
