Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,184
You list your companion as a second named guest and all should be fine.
Although you are breaking the rules of Marriott, you'll probably be fine. You might not get as many points as you expect though and you will only get one elite night credit for the 1st.