Coșeiu (Hungarian: Kusaly) is a commune located in Sălaj County, Crișana, Romania.

In 1432 Kwsal, 1450 Kwssal, 1505 Kwssaly, 1549 Kwsaly, 1591 Kusalj, Kussally, Kusaj, and in 1805 it was written as Coșeiu.

The kusalyi Jakcs have risen fast, having held high offices in the coming centuries.

In 1526, Michael Kusalyi Jackh attended the national assembly of Rakosi ambassador as the Diet of Bereg County.

The family name appears in documents in 1345 for the first time, and in the 1700–1800 years on the hilltops of the settlements traces of their castle can be seen.