We had multiple similar errors on ressies made on DVC points we rented over the years, no problem at checkin, in fact, we had a ressie for just the 2 of us in a BW standard studio in 2008 and my daughter and SIL joined us at the last minute, their names weren't even on the ressie, no problem, they even took DME back to MCO on one day's notice.
We just returned home today and our last name was wrong too! We rented points and I had them correct it, but they still spelled it wrong again. We have a very long name
But we had no problems with DME or even using our cards for the dining.