This is a list of surnames in which the usage is Irish; and the first letter is K.
Kavanagh IrishDerived from the Irish Gaelic name
Caomhánach, which means "a student of saint
Caomhán". It was the name used by a 12th-century king of Leinster, Domhnall Caomhánach, the eldest son of the historic Irish king Diarmait Mac Murchada.
Kearney IrishFrom the Irish name
Ó Ceithearnaigh meaning
"descendant of Ceithearnach", a given name meaning "warrior".
Keefe IrishAnglicized form of the Irish
Ó Caoimh meaning
"descendant of Caomh".
Keegan IrishFrom Irish
Mac Aodhagáin meaning
"descendant of Aodhagán". The given name
Aodhagán is a double diminutive of
Aodh.
Keeley IrishAnglicized form of Irish
Ó Caolaidhe meaning
"descendant of Caoladhe", a given name derived from
caol "slender".
Kelly 1 IrishAnglicized form of Irish
Ó Ceallaigh meaning
"descendant of Ceallach". Famous bearers include actor and dancer Gene Kelly (1912-1996) and actress and princess Grace Kelly (1929-1982).
Kennedy IrishFrom the Irish name
Ó Cinnéidigh meaning
"descendant of Cennétig". This surname was borne by assassinated American president John F. Kennedy (1917-1963).
Kilduff IrishFrom the Irish
Mac Giolla Dhuibh meaning
"son of the black-haired man".
Killough IrishIndicated a person who was from Killough (County Down, Northern Ireland) or Killough (Wicklow, Ireland). The place name Killough means "church on the lake", derived from the Irish
cill "church" and
loch "lake".
Kilpatrick IrishFrom the Irish
Mac Giolla Phádraig meaning
"son of the servant of Saint Patrick".