“Olive Oyl is named after olive oil, used commonly in cooking. Segar’s newspaper strips also featured a number of her relatives named after other oils, including her brother, Castor Oyl, their mother, Nana Oyl and their father Cole Oyl.”
Olive Oyl - Popeye the Sailor Wiki - Fandom
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Olive is the only truly edible one in the family, and quite tasty.