Western

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Old English westerne (see west, -ern).

wiktionary

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From Old English westerne, from Proto-Germanic *westrōnijaz.

Morphologically west +‎ -ern.

etymonline

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western (adj.)

"toward or of the west," late Old English westerne "western, westerly, coming from the west," from west + -erne, suffix denoting direction. The noun meaning "book or movie about the Old West" is first attested 1909. Westerner is from 1837 as "person from the U.S. West," 1880 as "Euro-American," as opposed to Oriental.