Brown Driver Briggs

 Shammua = "renowned"
1. son of Zaccur and the spy from the tribe of Reuben
2. son of David by his wife Bathsheba
  1) also 'Shammuah' and 'Shimea'
3. a Levite, son of Galal and father of Abda who lived in Jerusalem
after the return from exile in the time of Nehemiah
  1) also 'Shemaiah'
4. a priest, head of the family of Bilgah in the time of Joiakim
after the return from exile