In Jain tradition, Cheda Raja usually refers to King Chetaka of Vaishali. He was Lord Mahavira’s maternal uncle because Mahavira’s mother, Trishala, was Chetaka’s sister. ( jainqq.org)

His family members are described in Jain texts as follows:

• Sister: Trishala
• Daughter: Chellana, wife of King Shrenika/Bimbisara of Magadha
• Other daughters: Jyeshtha/Sujyeshtha, Prabhavati, Padmavati, Mrigavati, Shiva, and another daughter mentioned in some accounts, making seven daughters in total. ( jainqq.org)

So, in simple words: Cheda Raja = Chetaka, and his most well-known Jain family connection is through Trishala and his seven daughters, especially Chellana. ( jainqq.org)