What does the name kelly mean in greek?

Kelly is a surname of Gaelic and Irish origin, ultimately derived from the given name Ceallach, which is composed of the Celtic elements ceall [meaning "cell" or "church"] combined with each [meaning "horse"] or eachdaidh [meaning "horseman" or "cavalry"]. As a given name, Kelly is sometimes used as a feminine form of the masculine given name Kelly, which is also ultimately derived from Ceallach.