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Added before various suffixes (especially -ole and -on, but also sometimes -elle, -et, -ette, -eau, by analogy to or mistaken division of other words which end in erole, eron, ereau, etc, where the er was part of the first element (e.g. fougerolle, fougerole, from fougère + -ole) or the entire word was borrowed from another language such as Italian (e.g. muserole, muserolle, from Italian museruola).
Thomas S. Thomov, Morphologie du français moderne (1960), page 28
Romance Philology (1969), volume 23, page 298: "-erole ← -er- (< -ÅR) + -ole ( < -EOLU): maierole. A lengthened var. of -ole, this suffix appears in the late Middle Ages, formed through “false division”, namely the secondary rapprochement of, say, bannerole (banniere + -ole) or casserole with ban- or cass-. Is the -er- intercalated for rhythmic of differentiatory purposes? This "interfix" conveys no semantic message: It simply serves as an occasionally handy grammatical tool."
Nicol Christopher William Spence, The Structure(s) of French (1996), page 95: "Some suffixes have reinforced variants: for instance, -et is expanded to -elet in verdelet, -on to -eron in moucheron, and -er to -eter in bec > becqueter. The suffix -ie has a reinforced variant -erie (cf. bouffonnerie, pédanterie) on the model of the many words in -erie where the suffix had been added to a word ending in -(i)er (boulanger, épicier, laitier, etc). By analogy with a number of other nouns, adjectives and verb-forms, a linking -t- or -ll- is often inserted between a lexeme ending in a vowel and the suffix: cf. bureau > bureautique "
Laurie Bauer, English Word-Formation (1983), page 19: "Similarly, the suffix -eron which could once be used in French to form a word for the person who carries out an action (e.g. forg-er 'to forge' > forg-eron 'smith') is now no longer productive, and the suffix -eur (e.g. forg-er 'to forge' > forg-eur 'forger') is used productively in its place (Guilbert, 1975: 178-9)."