Brutus, The Giant Crocodile

Crocodilos/crocodeilos itself is described in reference sources as a corruption of crocè ("pebbly"), and drilos/dreilos supposedly meaning "worm" although attested only as "(man with circumcised) penis". It is unclear how well supported this analysis is. The meaning of crocè is explained as describing the skin texture of lizards (or crocodiles) in most sources, but is alternately claimed to refer to a supposed habit of (lizards or crocodiles) basking on pebbly ground.
The form crocodrillus is attested in Medieval Latin. It is not clear whether this is a medieval corruption or derives from alternate Greco-Latin forms (late Greek corcodrillos and corcodrillion are attested).
A (further) corrupted form cocodrille is found in Old French and was borrowed into Middle English as cocodril(le). The Modern English form crocodile was adapted directly from the Classical Latin crocodīlus in the 16th Century, replacing the earlier form.
The use of -y- in the scientific name Crocodylus (and forms derived from it) is a corruption introduced by Laurenti (1768).