Where does “firmhearted” come from?

firmhearted (English) comes from English firm, from Middle English ferme, from Old French ferme, from Medieval Latin ferma, from Latin Firma, from Latin Firmus, from Proto-Italic fermos, from Proto-Indo-European dʰer-mo-s — to support; to hold.

Ancestry of “firmhearted”, step by step

firmhearted traces back through two separate lines of ancestry.

via English firm

StepLanguageWordMeaning
1EnglishfirmA business partnership; the name under which it...
2Middle EnglishfermeA lease; the renting of land
3Old Frenchfermelease; the land leased; farm
4Medieval LatinfermaAlternative form of firma
5LatinFirmatax, tribute
6LatinFirmusstrong, powerful
7Proto-Italicfermos
8Proto-Indo-Europeandʰer-mo-sholding
9Proto-Indo-Europeandʰer-to support; to hold

via English hearted

StepLanguageWordMeaning
1Englishheartedsimple past tense and past participle of heart;...
2Middle EnglishhertedHaving a specified disposition, emotion, or...
3Middle EnglishherteThe heart; One's inner self; the mind or...
4Old Englishheorteheart
5Proto-West Germanichertāheart
6Proto-Germanichertôheart
7Proto-Indo-Europeanḱḗrheart
Every word from Proto-Indo-European dʰer-