French word agneau comes from Proto-Indo-European *h₂egʷnós (Lamb.)
*h₂egʷnós (Proto-Indo-European)
Lamb.
*agʷnos (Proto-Italic)
agnus (Latin)
A lamb, especially one used as a sacrifice.
agnellus (Latin)
A little lamb, lambkin.
agnel (Old French)
agneau (French)
Lamb (sheep meat). Lamb (young sheep). Lambskin.