unfamiliar territory

an area of knowledge unknown to the speaker. We are in unfamiliar territory and I don't know the answer. Astronomy is unfamiliar territory for me, and I cannot answer any questions about the stars.

Common Names:

Name	Pronounced	Usage
Iucunda	-	Late Roman
Domnika	-	Macedonian
Mergen	-	Turkmen
Alemayehu	-	Eastern African, Amharic
Rickey	RIK-ee	English
Mahala	-	English