Shri Simandhar Swami’s first Ganadhar is commonly given as Yugmandhar Swami. In Jain texts, Simandhar Swami is also listed among the 20 Viharman Tirthankars of Mahavideh Kshetra. ( jainqq.org)

If you meant the full list of Ganadhars, that is a separate list and can be named too.