Mich. Comp. Laws § 500.7022

Sec. 7022. No MEWA authorized under this chapter shall take any name which is the same as or closely resembles the name of any other MEWA doing business in this state. A MEWA shall transact its business under its own name, and shall not adopt any assumed name: excepting that a MEWA, by amending its articles, may change its name or take a new name with the approval of the commissioner. Whenever it shall be necessary, in any legal proceedings, to prove the existence of a MEWA, a certified copy of such MEWA's certificate of authority shall be prima facie evidence of the existence of the MEWA.