I have decided to name my app developement company Stag-O-Saurus but I am unsure of the ending, should it be Stag-O-Sarus Studios, Entertainment, Productions or games. What sounds better an is easier for customers to remember?
I would say use production or studio only if you are going to create things other than games. If you're only going to make games, i would go for "games", personally.
If it's games you are making then Games for sure. Also you could go for the stagosaur.us domain if it's not already taken, which would be awesome.
I like Studio as I think the whole Stag-O-Sarus Studios has a nice ring to it. Also if you ever choose to develop more than games you won't have to change the name...
If you do business in the US (eg. sell apps in that market), then you can register a .us even if you don't live there.
I just bought the domain and will resell for $500USD. No, jk. But wachout people do that. But as far as being allowed: http://www.netregister.biz/regoleus.htm and I say go with studios.
Chipping in my 2 cents... Studios and Productions would be more appropriate for an all-around multimedia company (games, entertainment, interactive apps, etc.). Entertainment has a wider coverage than Games but Games would be more focused (i.e. if I heard the name Stag-O-Saurus Games, I would immediately have an idea about your products). Your call actually! Plan out a future direction for your company and do consider that. Good luck!