Folk-etymological

In fact, it would seem that puerca is the folketymological form; […]

Source: wiktionary

Zafarambol (Zafranbolu, Safranbolu). The name has not been explained properly (Ramsay, HG 324, from Θεοδωρίαν πόλιν is impossible; Wittek, Byz. 10 [1935] 40 note 4: from (εἰ)ς Άδριανούπολιν with folketymological transformation is not convincing); […]

Source: wiktionary

In medical terminology, καταμήνια katamḗnia n.pl. 'menstruation' (derived from μήν mḗn 'month') was taken up by Oribasius latinus (6th c.) as cataminia with Middle Fr. catimini; the i of the latter reflected the folketymological influence of catir 'to hide', which also accounted for the semantic shift of the French idiom en catimini 'in secret'.

Source: wiktionary

Their rejection, to a certain extent, of the role of nurturing mothers was symbolized by their searing of their right breasts, a practice justified by folk-etymological derivations of their name from a-privative and mazos, ‘breast’ (although the ostensible purpose of the searing was to facilitate bowmanship, and Amazons are often spoken of as rearing children).

Source: wiktionary