unwritten law

An accepted although informal rule of behavior, as in It's an unwritten law that you lock the gate when you leave the swimming pool. [Mid-1400s]

Name	Pronounced	Usage
Marvyn	MAHR-vin	English (Rare)
Iona	[ai'əunə]
Anthea	AN-thee-ə (English)	Greek Mythology (Latinized)
Amin	-	Arabic, Persian, Urdu
AÑUli	-	Western African, Igbo
Yehoshafat	-	Biblical Hebrew