Answer

If you mean Bharata Chakravartin, his mother was Queen Yashovati of Lord Rishabhadeva. ( encyclopediaofjainism.com)

Explanation

In Jain tradition, Chakravartin is a title, not just one single person. There are twelve Chakravartins in the Bharata region in the current time cycle, so the mother depends on which Chakravartin you mean. ( jainworld.jainworld.com)

Spiritual Understanding

Chakravartins are remembered as highly पुण्यवान and powerful royal figures in Jain tradition, but their greatness is still worldly and temporary. Jain dharma teaches us to look beyond power and seek liberation. ( jainworld.jainworld.com)

Takeaway

Bharata Chakravartin’s mother was Queen Yashovati. For other Chakravartins, the mother’s name is different.