What does Kay mean?
Kay /kay/ [1 syll.] as a boys' name 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.
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 was first listed in 1920-1929 and reached its peak position of #572 in the U.S. during 1930-1939, but is not listed at the moment. (Top 1000 Baby Names Records, 2014)
Kai (#177 the previous year) is the only other popular varying form of Kay. Forms like Caio are uncommon. These boy names are at the peak of their popularity today (usage of 0.4115%), except for the version Kay which has become less in vogue. Kai (#177) is the most fashionable baby name in this compilation. Below is a charted analysis of the usage of Kay and affiliated names. (Top 1000 Baby Names Records, 2014)
Kay▼ is alike in pronunciation to Caw, Cayo, Coy▼, Key, 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 frequently used than Kay.