Where does “firstborn” come from?

Firstborn derives from English first and English bear, with first from English bere, from Proto-Germanic furistaz, from Proto-Indo-European per-, ultimately from Proto-Indo-European bʰer-.

firstborn (English): The first child to be born to a parent or family;...

Definitions

  1. The first child to be born to a parent or family;...

Ancestry of “firstborn”, step by step

firstborn traces back through two separate lines of ancestry.

via English born

StepLanguageWordMeaning
1Englishbornpast participle of bear; given birth to; past...
2EnglishbearA large omnivorous mammal, related to the dog and...
3Middle Englishberebear; To pierce
4Old Englishberebarley; first-person singular present indicative...
5Old Englishtūnenclosure, yard; place; dwelling
6Proto-West Germanictūnfence
7Proto-Germanictūnąfence; enclosure
8Gaulishdunumfort; hill, hillfort
9Proto-Celticdūnomstronghold, rampart
10Proto-Indo-Europeandʰewh₂-smoke; mist, haze

via English first

StepLanguageWordMeaning
1EnglishfirstPreceding all others of a series or kind; the...
2Middle Englishferst
3Old Englishfyrestfirst
4Proto-Germanicfuristat first, firstly, in the first place
5Proto-Germanicfuristazfirst, foremost
6Proto-Germanicfurifor, before; before, forward
7Proto-Indo-Europeanpreh₂-before, in front
8Proto-Indo-Europeanper-before, in front; first; to go through
9Proto-Indo-Europeanpr̥tóspassed , crossed
Every word from Proto-Indo-European dʰewh₂-