Deen is an English spelling of the Arabic din and means "religion" or "faith", the element in names such as Salahuddin and Nuruddin; for non-Muslim families it is simply a variant of Dean, which means "valley". The single syllable fits beside Zayn, Zain and Amir. In the United States Deen climbed from number 9372 in 2000 and number 2931 in 2015 to a peak of number 1882 in 2023, and it ranks number 1996 in 2025.