Do I have any tenant rights in Dubai if my name isn't on the Ejari?

You have some protection, but your position is weaker than a registered tenant's, and much depends on whether the landlord approved the subletting. In Dubai, subletting requires the landlord's written consent; where it exists, you have a recognisable tenancy relationship with the main tenant, and disputes between you go to the Rental Disputes Centre (RDC) like any other rent dispute. Even without Ejari in your name, occupants who can prove they paid rent and lived in the unit have brought claims, so start collecting evidence now: payment receipts or bank transfers, messages about the room, and anything showing your dates of occupancy. A week's notice has no legal basis, and nobody may remove you by force — only a court process can order an eviction. Two risks to keep in mind: if the landlord never consented, the entire sublease can be terminated, and partitioned rooms often breach Dubai Municipality rules, which limits how hard you can push. Try to settle the demand in writing first; if he persists, the RDC is the venue. A licensed tenancy lawyer in Dubai can quickly assess how strong your evidence is before you file anything.