From BiblePortal Wikipedia

Smith's Bible Dictionary [1]

Ha'shum. (Rich).

1. Bene-Hashum, (that is, sons of Hashum), 223 in number, came back from Babylon with Zerubbabel.  Ezra 2:19;  Ezra 10:33;  Nehemiah 7:22. (B.C. Before 536). The chief man of the family was among these, who sealed the covenant with Nehemiah.  Nehemiah 10:18. (B.C. 410).

2. One of the priests or Levites, who stood on Ezra's left hand, while he read the law to the congregation.  Nehemiah 8:4. (B.C. 410).

Easton's Bible Dictionary [2]

  • Stood on Ezra's left hand while he read the law ( Nehemiah 8:4 ).

    Copyright Statement These dictionary topics are from M.G. Easton M.A., DD Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.

    Bibliography Information Easton, Matthew George. Entry for 'Hashum'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/h/hashum.html. 1897.

  • Hastings' Dictionary of the Bible [3]

    Hashum 1. The eponym of a family of returning exiles (  Ezra 2:19;   Ezra 10:33 ,   Nehemiah 7:22;   Nehemiah 10:18 ); called in 1Es 9:33 Asom . 2. One of those who stood on Ezra’s left hand at the reading of the Law (  Nehemiah 8:4 ); called in 1Es 9:44 Lothasubus .

    Morrish Bible Dictionary [4]

    1. Ancestor of some who returned from exile, some of whom had married strange wives.  Ezra 2:19;  Ezra 10:33;  Nehemiah 7:22 .

    2. One who assisted Ezra when he read the law.   Nehemiah 8:4 .

    3. A chief of the people who sealed the covenant.   Nehemiah 10:18 .

    Holman Bible Dictionary [5]

     Ezra 10:33 2 Nehemiah 8:4 Nehemiah 10:18

    Cyclopedia of Biblical, Theological and Ecclesiastical Literature [6]

    (Heb. Chashum', חָשֻׁם , Opulent; Sept. Ἀσούμ , Ἀσήμ , ᾿Ησαμί , ᾿Ωσύμ , ᾿Ησάμ ), the name apparently of two or three men about the time of the Captivity.

    1. An Israelite whose posterity (or rather,. perhaps, am place whose inhabitants), to the number of 223 males,. or 328 in all, returned from Babylon with Zerubbabel. ( Ezra 2:19;  Nehemiah 7:22); some of whom afterwards. divorced their Gentile wives ( Ezra 10:33). The associated names seem to indicate a locality in the northwestern part of the territory of Benjamin. B.C. ante 536.

    2. One of those who stood at Ezra's left hand while he was reading the law to the people ( Nehemiah 8:4); probably the same with one of the chief of the people who subscribed Nehemiah's covenant ( Nehemiah 10:18). B.C. cir. 410.

    International Standard Bible Encyclopedia [7]

    hā´shum ( חשׁם , ḥāshum ):

    (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; 1 Esdras 9:44, "Lothasubus"). The signer of the covenant ( Nehemiah 10:18 ) is possibly the same.