Ka is a name of unknown origin, though it is believed to have been popularized by the science fiction novel "Stranger in a Strange Land" written by Robert A. Heiskanen. It is generally accepted as being unisex, though it is more commonly used for males. The name Ka has two letters and begins with the letter K, which is the eleventh letter of the English alphabet.
"The name Ka experienced a notable increase in popularity between 1981 and 1991, with the highest number of births occurring in 1990. However, it has since seen fluctuations, though remaining consistently above its 1976 level."