Chandanbala was a prominent female figure in Jain tradition, best known for her association with Lord Mahavira. Her father's name was King Dhanavah (sometimes also referred to as Dhanvardhan or Dhanavai in various Jain texts). Chandanbala's birth name was Vasumati, and she was later known as Chandanbala after her time in captivity.

So, Chandanbala na bhai nu naam (the name of Chandanbala's brother) is not prominently mentioned in the main Jain scriptures or stories. Most Jain texts focus on her relationship with her father and her role in offering food to Lord Mahavira after his year-long fast. If you are looking for the name of her brother specifically, it is not commonly recorded or emphasized in Jain narratives.