GASHMU

gash'-mu, gash'-moo (gashmu): A form of the name GESHEM (which see), found in Nehemiah 6:6 (compare Nehemiah 6:1), "And Gashmu saith it." According to BDB the same termination -u is found in Nabatean proper names.

From the International Standard Bible Encyclopedia
Edited by James Orr, published in 1939 by Wm. B. Eerdmans Publishing Co.