4 occurrences in 4 dictionaries
Reference: Ader
Fausets
Morish
A'der
Son of Beriah, a descendant of Benjamin. 1Ch 8:15.
Smith
A'der
(flock), a Benjamites, son of Beriah, chief of the inhabitants of Aijalon.
The name is more correctly Eder.
Watsons
ADER. Jerom observes, that the place where the angels declared the birth of Jesus Christ to the shepherds, was called by this name, Lu 2:8-9. The empress Helena built a church on this spot, the remains of which are still visible.