Where does “lambsquarter” come from?

lambsquarter (English) comes from English Lamb, from French agneau, from Old French agnel, from Latin agnellus, from Latin -ellus, from Latin -ulus, from Proto-Italic -olos, from Proto-Italic -elos — Forms agent nouns from verbal roots.

Ancestry of “lambsquarter”, step by step

lambsquarter traces back through two separate lines of ancestry.

via English Lamb

StepLanguageWordMeaning
1EnglishLambOS grid ref NT5386
2Frenchagneaulamb; lambskin
3Old Frenchagnel
4Latinagnellusa little lamb, lambkin
5Latin-ellusAlternative form of -ulus; "forming masculine...
6Latin-ulusUsed to form a diminutive of a noun, indicating...
7Proto-Italic-olos
8Proto-Italic-elosForms desubstantival and deadjectival diminutive nouns
9Proto-Indo-European-e-lós
10Proto-Indo-European-lósForms agent nouns from verbal roots

via English quarter

StepLanguageWordMeaning
1Englishquarter"A fourth part of something."; "Place or...
2Middle EnglishquarterA quarter fourth part of something
3Anglo-Normanquarter
4Latinquartariusquartarius, a Roman unit of liquid measure equivalent to about 0.14 L
5Latinquārtusfourth
6Proto-Indo-Europeankʷeturtos
7Proto-Indo-Europeankʷetwóresfour
8Proto-Indo-Europeankʷe-and
Every word from Proto-Indo-European -lós