Question about the title (thai speakers please respond)

Ruang = the title , Rak = love. noi nid = little or you can think of it as the nicknames in the movie, mahasan = tremendous. so it means Love Noi and Nid badly or another meaning is A little tremendous love. << it is weird though. And It has nothing to do with Last life in the universe.
Noi is a little and Nid is also a little. It's like you can use only one word for a little, but you can say NoiNid << it makes the word more beautiful.

I hope it helps.

They have an interview with director which talks about alot of stuff (some quite interesting as I didnt even notice before I was told :) but the title is supposed to be a paradox

"The title has several layers of meaning
Noi and Nid are the sisters names and the words both mean "little"
Mahasan means enormous; the combination of these words is to signify paradox"

Rak does mean love as previously posted above