Just the name, not referring to any actual beach (sea, sun, sand).
http://www.thebeach-g-thailand.com/thebeachresort.html
(not up to date, still lists The Beach Khon Khaen, S Sauna, Wave Club which all have been closed for months)

Side note: there is indeed a beach in Khon Kaen province, on Ubonratana dam, which is called Pattaya 2!
https://www.google.co.th/maps/place/Pattaya+2/