Stephania - no, there's no other meaning, it comes from Stephen and means "crown".
Torian - this is interesting. It could be (click hyperlinks): - a variation of Dorian - a masculinisation of Toria - a variation of Torin or it might be none of the above! Where did you find it when you gave the name to your son?
Amarya - it could be (click hyperlinks): - a variation of Amara - a feminisation of Amar - a feminisation of Amariah - a variation of Amaya or none of the above - likewise, where did you get the name from?