Where does “شاه” come from?

شاه (Classical Persian) comes from Middle Persian 𐭬𐭫𐭪𐭠, from Old Persian 𐏋, from Proto-Iranian xšáyati, from Proto-Indo-Iranian kšáyati, from Proto-Indo-European teḱ- — to sire, beget.

Ancestry of “شاه”, step by step

Step	Language	Word	Meaning
1	Middle Persian	𐭬𐭫𐭪𐭠	king
2	Old Persian	𐏋	king
3	Proto-Iranian	xšáyati	—
4	Proto-Indo-Iranian	kšáyati	he rules, he has power over
5	Proto-Indo-European	teḱ-	to sire, beget

Words derived from “شاه”

check
chess
checklist
cheque
checkpoint
paycheck
shah
exchequer
checker
checkers
checkered
checkbox
chessboard
checkerboard
checksum
uncheck
recheck
checkable
checkmark
chequer
Shahnameh
chequebook
checkmarks
chessman

Every word from Proto-Indo-European teḱ- →Every word from Proto-Indo-Iranian kšáyati →Every word from Proto-Iranian xšáyati →