Where does “melissis” come from?

melissis (Proto-Celtic) comes from Proto-Celtic meli, from Proto-Indo-European mélid — honey.

Ancestry of “melissis”, step by step

StepLanguageWordMeaning
1Proto-Celticmelihoney
2Proto-Indo-Europeanmélidhoney
Every word from Proto-Indo-European mélid →Every word from Proto-Celtic meli →