The Meaning of Rakpasa

'Rak' means "Preserve or Conserve ". The original word is "Anurak".
Sometimes you hear "Rak Look" which means "To preserve the World"
"Rak Sing-waet-lorm" means "To preserve environment"
or "Rak sook-ka-parp" means "To keep healthy".
Mostly it used for campaign.
So "Rak Pasa" means "To preserve the Language".

Also "Rak" means "Love". It has the same pronunciation, but different writing.
Let's learn some phrase about love.
"pom rak kun" (I love you that's used by a man.)
"chan rak kun" (I love you that's used by a woman.)
"rao rak grung-tayp laeh mue-ang Thai" (We love Bangkok and Thailand.)

Let's know writing way of "Rak"
อนุรักษ์ (A-nu-rak = To preserve or conserve)
รักษ์ (Rak = To preserve or conserve)
รักษา (Rak-saa = To keep or preserve)
รัก (Rak = Love)