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
Olanrewaju	-	Western African, Yoruba
Jillian	['dʒiliən]
Szczepan	SHCHE-pahn	Polish
Iair	-	Biblical Latin, Biblical Greek
Judie	JOO-dee	English
Willahelm	-	Ancient Germanic