Where does “מַתִּתְיָהוּ” come from?

מַתִּתְיָהוּ (Hebrew) comes from Hebrew יהוה, from Proto-Semitic *haway-.

Ancestry of “מַתִּתְיָהוּ”, step by step

Step	Language	Word	Meaning
1	Hebrew	יהוה	YHWH, Yahweh, Jehovah; God; Yahweh
2	Proto-Semitic	*haway-	—

מַתִּתְיָהוּ — Etymology, Origin & Word History | Etymology Explorer