Meaning and name origin
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 is not a popular first name for males but a very popular surname or last name for all people (#1508 out of 88799, Top 2%) (2000 U.S. Census).
Displayed below is the baby name popularity of the name Kay for boys. Kay reached its highest rank of #572 in the U.S. in 1930-1939. (2014 statistics).
Displayed below is a comparison of the popularity of the boy name Kay and its variant forms. Popular variation forms ranked in the Top 1000/100 are Kai (#177) and Kay. (2014 statistics).
Kay▼ is also pronounced similarly to Cai, Caw, Cayo, Coy▼, Kaye, Key, Keye, Koa and Kye. Other suggested similar baby names are Bay, Day, Fay▼, Gay, Jay▼, KC, Kacy, Kaj, Kam, Kaz, Klay, Ray▼, Tay and Way. These names tend to be more commonly used than Kay.