|Easton's Bible Dictionary|
(1.) Ezra 2:19; Nehemiah 7:22.
(2.) Stood on Ezra's left hand while he read the law (Nehemiah 8:4).
Int. Standard Bible Encyclopedia
(1) In Ezra 2:19 Nehemiah 7:22, "children of Hashum" are mentioned among the returning exiles. In Ezra 10:33 (compare 1 Esdras 9:33, "Asom"), members of the same family are named among those who married foreign wives.
(2) One of those who stood on Ezra's left at the reading of the law (Nehemiah 8:4; APC 1Esdras 9:44, "Lothasubus"). The signer of the covenant (Nehemiah 10:18) is possibly the same.
Hashum (4 Occurrences)
Ezra 10:33 Of the sons of Hashum: Mattenai, Mattattah, Zabad, Eliphelet, Jeremai, Manasseh, Shimei. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)
Nehemiah 7:22 The children of Hashum, three hundred Twenty-eight. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)
Nehemiah 8:4 Ezra the scribe stood on a pulpit of wood, which they had made for the purpose; and beside him stood Mattithiah, and Shema, and Anaiah, and Uriah, and Hilkiah, and Maaseiah, on his right hand; and on his left hand, Pedaiah, and Mishael, and Malchijah, and Hashum, and Hashbaddanah, Zechariah, and Meshullam. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)
Nehemiah 10:18 Hodiah, Hashum, Bezai, (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)