Where does “Judæo-Christian” come from?

Judæo-Christian (English) comes from English christian, from Middle English Cristien, from Old French chrestien, from Latin Christiānus, from Latin Chrīstus, from Ancient Greek Χριστός, from Ancient Greek χρίω, from Proto-Indo-European gʰrēy- — to rub; to stroke; to grind.

Ancestry of “Judæo-Christian”, step by step

Judæo-Christian traces back through two separate lines of ancestry.

via English christian

StepLanguageWordMeaning
1EnglishchristianA believer in Christianity
2Middle EnglishCristienChristian; of those who believe in Christ;...
3Old FrenchchrestienChristian
4LatinChristiānusChristian
5LatinChrīstus
6Ancient GreekΧριστόςanointed; messiah; annointed, the annointed one,...
7Ancient Greekχρίωto rub or smear (especially the body) with oil or unguents; to anoint
8Proto-Indo-Europeangʰrēy-to smear; to paint, streak, smear
9Proto-Indo-Europeangʰer-to rub; to stroke; to grind

via English Judæo

StepLanguageWordMeaning
1EnglishJudæo
Every word from Proto-Indo-European gʰer-