JacksonEnglish Means "son of Jack". Famous bearers of this name are the American president Andrew Jackson (1767-1845) and the singer Michael Jackson (1958-2009).
JanvierFrench Either from the given name Janvier or the French word janvier meaning "January", perhaps indicating a person who was baptized in that month.
Jeanes 1English Derived from the given name Jan, a medieval English form of John.
JeffersEnglish Patronymic from the given name Jeffrey. A famous bearer was poet Robinson Jeffers (1887-1962).
JeffersonEnglish Means "son of Jeffrey". A famous bearer was American president Thomas Jefferson (1743-1826). Since this surname was sometimes adopted by freed slaves, it is now more common among the African-American population.
JekyllEnglish Derived from the Breton given name Judicaël. This name was used by Robert Louis Stevenson for the character of Dr Henry Jekyll in the book Strange Case of Dr Jekyll and Mr Hyde (1886).
JenkinsEnglish From the given name Jenkin, a diminutive of Jen, itself a Middle English form of John.
JenningsEnglish From the given name Jenyn, a diminutive of Jen, itself a Middle English form of John.
JeromeEnglish Derived from the given name Jerome. A famous bearer of this surname was the American-born Jennie Jerome (1854-1921), Lady Randolph Churchill, mother of Sir Winston Churchill.
KatóHungarian Derived from a diminutive of the Hungarian feminine given name Katalin.
KavanaghIrish Derived 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.
KennedyIrish From the Irish name Ó Cinnéidigh meaning "descendant of Cennétig". This surname was borne by assassinated American president John F. Kennedy (1917-1963).
LawrenceEnglish Derived from the given name Laurence 1. Famous bearers include revolutionary T. E. Lawrence (1888-1935) and author D. H. Lawrence (1885-1930).
LennonIrish Anglicized form of the Irish name Ó Leannáin, which means "descendant of Leannán". The byname Leannán means "lover". The name was borne by the musician John Lennon (1940-1980).