What is the meaning of -ba?

Kinship suffix. It is usually found attached to unknown stems.

forms feminine nouns usually denoting an action, process or its result

Romanization of -𐌱𐌰

into

Eye dialect spelling of -ban.

Rōmaji transcription of

forms feminine nouns meaning the action of a verb

Suffix appended to words to create a feminine noun, usually denoting an action.

Source: wiktionary.org