🔼The name Nephisim in the Bible
The name Nephisim (נפיסים) or Nephushim (נפוסים), depending on the manuscript we consult, belongs to an ancestor of a family of Nethinim (temple servants) who returned from Babylon with Zerubbabel and Jeshua (Ezra 2:50). Nehemiah mentions the same person, but calls him Nephishesim (נפישסים) or Nephushesim (נפושסים; Nehemiah 7:52).
🔼Etymology of the name Nephisim
The name Nephisim, Nephushim, Nephishesim or Nephushesim is a plural form derived from a root נפס (nps) but no such root exists in the Hebrew of the Bible. Alfred Jones (Dictionary of Old Testament Proper Names) declares that נפס (nps) is the Chaldean or Syriac version of the familiar Hebrew noun נפש (nepesh), which primarily denotes a living being and secondarily may have to do with to enlarge:
For a meaning of our name, Jones' Dictionary of Old Testament Proper Names reads Expansions (from the secondary meaning of the root). Neither NOBSE Study Bible Name List nor BDB Theological Dictionary offers an interpretation of our name.