a-mash'-si `amashcay, probably a textual error for `amashay; the ("s") implies a reading `-M-C-Y, based on a mistaken derivation from '-M-C. The original reading may have been `ammishay; compare AMASAI):

Amashsai is a priestly name in the post-exilic list of inhabitants of Jerusalem (Nehemiah 11:13; Maasai, 1 Chronicles 9:12); the reading in Chronicles is ma`asay, the King James Version "Maasiai," the Revised Version (British and American) "Maasai."

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'AMASHSAI'". "International Standard Bible Encyclopedia". 1915.