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English word gullible comes from English gull, English -ible
gull (English)
(US, slang) To mislead.. (US, slang) To trick and defraud.. To deceive or cheat. A seabird of the genus Larus or of the family Laridae. (obsolete, Oxford University slang) A swindler or trickster.. (slang) A cheating trick; a fraud.. One easily cheated; a dupe.
-ible (English)
An adjective suffix, now usually in a passive sense; forms adjectives meaning "able to be", "relevant or suitable to, in accordance with", or expressing capacity or worthiness in a passive sense. An instrumental suffix; forms nouns representing:. A place or location. A tool or instrument.
gullible (English)
Easily deceived or duped; naïve, easily cheated or fooled.