some. a portion.
chiefs. heads.
gave. Nehemiah mentions what he, the chiefs, and the rest of the people gave. Ezra (Neh 2:68, Neh 2:69) mentions what only one portion gave. Hence the numbers are necessarily different.
Related Commentaries of Nehemiah 7:70
Nehemiah 7:70
70 And some of the chief of the fathers gave unto the work. The Tirshatha gave to the treasure a thousand drams of gold, fifty basons, five hundred and thirty priests' garments.