What is the meaning of -ga?

ending of the comitative case

Added to nouns to form adjectives.

Rōmaji transcription of

mother

Diminutive suffix, used especially in familiar names for pets.

turns an adjective with -ugr into a transitive verb

Used to form nouns denoting the action of the suffixed verb; -ion, -ing

Used to form nouns denoting the event of the suffixed verb; -ion, -ing

Used to form nouns denoting the object of the suffixed verb.

going

Used to make a verb into a noun with a related meaning.

the

to (dative case)

Source: wiktionary.org