In Jainism, you can be Jain regardless of your birth or caste. There are indeed Rajputs who have embraced Jainism (i.e., Jain Rajputs), but not all Rajputs are Jain, and there are many Jains from other communities as well. So “Jain Rajput” describes a Jain who belongs to a Rajput lineage, not a separate Jain sect or caste.