Judaism

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from late Latin Judaismus, from Greek Ioudaïsmos, from Ioudaios (see Jew).

wiktionary

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Hebrew יְהוּדָה‎ (Yehuda, “ Judah”) +‎ -ism (from Latin). Doublet of Judezmo.

etymonline

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Judaism (n.)

c. 1400 (attested in Anglo-Latin from mid-13c.), from Old French Judaisme and directly from Late Latin Judaismus, from Greek Ioudaismos, from Ioudaios "Jew" (see Jew). The Anglo-Latin reference is from a special tax levied on the Jews of England. Earlier in same sense was Juhede "Jewish faith, Judaism," literally "Jew-hood" (early 14c.).