Jaddua

Known. One of the chiefs who subscribed the covenant (Nehemiah 10:21).

The last high priest mentioned in the Old Testament (Nehemiah 12:11,22), sons of Jonathan.

Source: Easton's Bible Dictionary
Jaddua

(known ). Son and successor in the high priesthood of Jonathan or Johanan. He is the last of the high priests mentioned in the Old Testament, and probably altogether the latest name in the canon. (Nehemiah 12:11,22) (B.C. 406-332.) One of the chief of the people who sealed the covenant with Nehemiah. (Nehemiah 10:21) (B.C. 410.)

Source: Smith's Bible Dictionary