Gender / Sex: boy (Kay's also a girl name)
Meaning: happy, rejoicing
Related Names: Keyes, Caius
Sounds Like: Kaye, Gay, Kaj, Key
Variant forms: Kai, Keh
Rank as Last Name (Surname, Family Name): 1508
Kay \kay\ as a boy's name (also used as girl's name Kay), is of Latin and Old Welsh origin, and the meaning of Kay is "happy, rejoicing". From Gaius. Ancient name borne, in legend, by a knight of the Round Table. Now more common as a woman's name.
Kay has 2 variant forms: Kai and Keh.
For more information, see also related names Keyes and Caius.
Baby names that sound like Kay are Kaye, Gay, Kaj and Key.
View a list of the 5 names that reference Kay.
Kay is not a popular first name for men but a very popular surname or last name for both men and women (#1508 out of 88799). (1990 U.S. Census)