Amashai was a priestly descendant of Azareel who lived in the time of Nehemiah. He was appointed to reside in Jerusalem and serve in the temple. He is apparently the same person as Maasiai mentioned in the parallel genealogy.
Amashai is named among the priests connected with Jerusalem’s restored worship and temple service in the postexilic period.
The supplied material dates him to about 440 B.C. and identifies him with Maasiai in 1 Chronicles 9:12.