Aswa (アスワ, Asuwa) is Kohza's mother and Toto's wife. She only appears during the Vivi and Kohza Flashback yelling at Kohza to come and eat. It's not known what happened to her in the current story, as she does not appear with Toto in Yuba and does not appear to support Kohza. She doesn't make an appearance in the entire Arabasta arc.
First Appearance: Chapter 163; Episode 100

Source: http://onepiece.wikia.com/wiki/Aswa