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Kay (boy)

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What does Kay mean?

Kay /kay/ as a boys' name (also used as girls' 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 variants: Kai and Keh.

Related boy names: Keyes and Caius.

Kay has 6 more alternative forms via Gaius: Cai, Caio, Kaye, Keye, Keyes and Keys.

Kay has 3 feminine forms: Jay, Kai and Kaylee.

Kreatif forms:
(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)


Ranking and usage % can show different trends depending on the distribution of names that year.

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)

Top 2000 baby names ranking of Kay name in U.S.

Top 100 baby names ranking of Kay outside U.S.

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.

Top 2000 baby names ranking of Kay, Caius, Kai, Kaye in U.S.

Top 100 baby names ranking of Kai outside U.S.

Similar Names


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.