Gaelen is of Scottish origin, derived from the family name 'Gael'. It means "small" or "lean". In Scottish Gaelic, it's pronounced as 'GAY-lin'. This name gained popularity in the English-speaking world due to its unique sound and spelling.
English Scottish
"The name Gaelen experienced fluctuating popularity with peaks in the late '90s and early 2000s, and a noticeable gap from 1983 to 1985."