What does Kay mean?
From Gaius. Ancient name borne, in legend, by a knight of the Round Table. Now more common as a woman's name.
(male) Kainy, Kimay, ..
(female) Kasty, Kayka, ..
How popular is Kay?
Kay is an unusual given name for males but a very prominent last name for both adults and children (#1402 out of 150436, Top 1%). (2000 U.S. Census)
Displayed below is the baby name popularity of Kay for boys. Kay reached its peak position of #505 in the U.S. during 1930-1939, but is not listed at the moment. (Top Baby Names, 2014)
Caius (#1375 from current records), Kai (#177) and Kaye are the popular varying forms of Kay. Other forms, like Keyes, are uncommon. These relations of Kay are at the peak of their popularity today (usage of 0.13%), except for the version Kay which has become less in vogue. Kai is the most fashionable baby name in this compilation.
Kay▼ is alike in pronunciation to Caeo, Caw, Cayo, Coe, Coy▼, Coye, Kauai, Kawai, Key, Koa and Kye. Other suggested similar names are Bay, Day, Fay▼, Gay, Jay▼, Kacy, Kaj, Kam, Kaz, Klay, Ray▼, Tay and Way. These names tend to be more frequently used than Kay.