Where does “Jebtōm̧ba” come from?

Jebtōm̧ba (Marshallese) comes from English September, from Latin september, from Latin Septem, from Proto-Italic septem, from Proto-Indo-European septḿ̥ — seven.

Ancestry of “Jebtōm̧ba”, step by step

StepLanguageWordMeaning
1EnglishSeptemberThe ninth month of the Gregorian calendar, following August and preceding October, containing the southward equinox
2Latinseptemberof September
3LatinSeptemseven; 7
4Proto-Italicseptemseven
5Proto-Indo-Europeanseptḿ̥seven
Every word from Proto-Indo-European septḿ̥ →Every word from Proto-Italic septem →Every word from Latin Septem →