Where does “firma” come from?

firma (Medieval Latin) comes from Old English feorm, from Proto-Germanic fermō, from Proto-Germanic ferhwō, from Proto-Indo-European perkʷ- — oak.

Ancestry of “firma”, step by step

StepLanguageWordMeaning
1Old Englishfeormfood, sustenance, provision; meal, feast,...
2Proto-Germanicfermōmeans of living, subsistence
3Proto-Germanicferhwōlife force, body, being
4Proto-Indo-Europeanperkʷ-oak

Words derived from “firma”

Every word from Proto-Indo-European perkʷ- →Every word from Proto-Germanic ferhwō →Every word from Proto-Germanic fermō →