Borrowed from Latin -ger, from gerō (“to carry, to bear”).

-gero m

1. forms adjectives meaning “-bearing, -carrying” from nouns

• -gero in Treccani.it – Vocabolario Treccani on line, Istituto dell'Enciclopedia Italiana

• egro, ergo, ergo-, orge

• (Classical Latin) IPA^(key): [ɡɛ.roː]
• (modern Italianate Ecclesiastical) IPA^(key): [d͡ʒe.ro]

-gerō

1. dative/ablative masculine/neuter singular of -ger