4 occurrences in 4 dictionaries
Reference: Machnadebai
Fausets
Hastings
One of the sons of Bani, who had married a foreign wife (Ezr 10:40).
Morish
Machnadeba'i
One who had married a strange wife. Ezr 10:40.
Smith
Machna-de'ba-i
(what is like the liberal?), one of the sons of Bani who put away his foreign wife at Ezra's command.