Where does “fatherline” come from?

fatherline (English) comes from English father, from Middle English fader, from Old English fæder, from Proto-West Germanic fader, from Proto-Germanic fadēr, from Proto-Indo-European ph₂tḗr, from Proto-Indo-European peh₂- — to protect; to shepherd.

Ancestry of “fatherline”, step by step

fatherline traces back through two separate lines of ancestry.

via English father

StepLanguageWordMeaning
1EnglishfatherA male who begets a child; A male ancestor more...
2Middle EnglishfaderA father; the male direct ancestor of someone or...
3Old Englishfæderfather
4Proto-West Germanicfaderfather
5Proto-Germanicfadērfather
6Proto-Indo-Europeanph₂tḗrfather
7Proto-Indo-Europeanpeh₂-to protect; to shepherd

via English line

StepLanguageWordMeaning
1EnglishlineA path through two or more points (compare ‘segment’); a continuous mark, including as made by a pen; any path, curved or straight
2Middle Englishlinerope, cord; line, rule, ruler, measure; rule,...
3Old Englishlīneline, rope, cord; line, cable, rope, hawser,...
4Proto-West Germanic*līnāline, chord, rope, string
5Proto-Germaniclīnǭthat which is made of flax; line, chord, rope,...
6Proto-Germaniclīnąflax
7Proto-Indo-Europeanlīno-flax
Every word from Proto-Indo-European peh₂-Every word from Proto-Indo-European ph₂tḗrEvery word from Proto-Germanic fadēr