Guillemots is the
common name for several species of
seabird in the
auk family (part of the order
Charadriiformes). In British use, the term comprises two genera:
Uria and
Cepphus. In
North America the
Uria species are called "murres" and only the
Cepphus species are called "guillemots". This word of French origin apparently derives from a form of the name
William, cf. .