4 occurrences in 4 dictionaries
Reference: Ismachiah
Fausets
Hastings
A Levite in the time of Hezekiah (2Ch 31:13). Cf. Semachiah.
Morish
Ismachi'ah
A Levite, set over the offerings, tithes, and dedicated things in the time of king Hezekiah.
Smith
Ismachi'ah
(whom Jehovah upholds), a Levite who was one of the overseers of offerings during the revival under King Hezekiah.
(B.C. 776.)