|Easton's Bible Dictionary|
Fabricator, an Israelite who renounced his Gentile wife after the Return (Ezra 10:37).
Int. Standard Bible Encyclopedia
JAASU; JASSAI; JAASAU
ja'-a-su (the Revised Version (British and American) and Kethibh, ya`asu, meaning uncertain); (the Revised Version margin and Qere, ya`asay), (the King James Version): In Ezra 10:37, one of those who had married foreign wives. Septuagint translates the consonantal text as a verb, kai epoiesan, "and they did." 1 Esdras 9:34 has "Eliasis."
Jaasau (1 Occurrence)
Ezra 10:37 Mattaniah, Mattenai, and Jaasau, (KJV WBS YLT)