Gailynn is of Welsh origin, derived from the elements 'gaile' meaning 'cheerful', and 'yn' which signifies 'from'. The name was traditionally given to daughters born on a Monday, as it translates to 'Monday's child'. It gained popularity in the English-speaking world during the 20th century, often favored for its unique sound and Welsh heritage.
"Gailynn was quite popular as a baby girl name in 1994, with five newborns sharing it that year."