3 occurrences in 3 dictionaries
Reference: Zatthu
Fausets
Ne 10:14. The sons of Zatthu were a family of laymen who returned with Zerubbabel (Ezr 2:8; Ne 7:13). Some married foreign wives (Ezr 10:27).
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Morish
Zat'thu
One who sealed the covenant. Ne 10:14. The Hebrew is the same as ZATTU.