I’ve done 1 and come in a couple of times without each year. Just applied for METV. Came back in 24 hours.
Going for 50 days next month then back early Nov. It runs out on Dec 20 so will have a week in Vietnam or Malaysia returning 16Dec maybe and should get 60 days on returning. An option if you are leaving Thailand for a good few weeks in between trips.
Will help if you bring a spare passport photo and download and print a TM7 form. Then when there you need a copy of you arrival stamp. Will save time in office when extending.
The single entry normally starts from day you request. The MEtv from issue. With this you get 60 days on arrival each time you arrive up to 4th December . As for the name reversal- if passport number and all other info on visa match I’d not worry but would try and check with Embassy visa enquiries.
Good luck. I’m doing one soon. How long did they take to issue yours?