Dahler

From Old Norse dalr meaning "valley," hence a topographical name for someone who lived in a valley or a habitational name for someone from a place called with this word.

From a short form of an ancient Germanic personal name, possibly a cognate with Anglo-Saxon deal, the first part of which means “proud” or “famous.”

Habitational name from the farm name Daler, a plural indefinite form of dal meaning “valley.”