What is the meaning of -ito?

See -it-

used with a stem to form the past participle of regular -ire verbs

Forms frequentative verbs from existing verbs or from certain adjectives (notably adjectives of the third declension in -is, -alis, and -bilis/-ibilis)

-ie (forms diminutives)

-ite (forms the names of rocks and minerals)

forms diminutives of nouns

forms names of minerals

forms the name of a salt derived from an acid with a low oxidation number (similar to -ite in English)

used to form diminutives of nouns

Source: wiktionary.org