2 Tranquil names that mean tranquil for girls, listing Tranquil baby names 1-2. Halcyone and Sedona are uncommon names. View Tranquil baby names for name meanings, search Tranquil names for boys, or search other baby names.
Halcyone ... hence the expression "halcyon days" to mean a time of tranquil happiness. 
Sedona Place name: city in Arizona known for its natural beauty and tranquil ambience. 
Related tags: calm, pacific, pastoral, peaceful, serene, smooth, soft, still.