Kelyn is of Welsh origin, meaning 'harmony' or 'peace'. It's a unisex name but was more commonly used for boys during the 1960s and 1970s in England and Wales.
The name Kelyn appears to have been popular among parents in the late 20th and early 21st centuries, with a noticeable spike in usage between 1995 and 2006. The highest number of babies named Kelyn was recorded in 2006 with 22 births, while there were years when it seemed to fall out of favor, such as 1981 with only 5 births and 2002 with just 7 births. Overall, the name has been given to 428 babies over the course of these statistics.