Baby name for our soon to be adopted son.

We recently just got a baby at 3 days old He is 2 weeks old now and we are in the process of adopting Him. At Birth He was given the name Jase and all though we like the name, we feel a little at a loss because this is our first child and we didn't get to choose his name. Because we are adopting Him, we have the choice to change his name and are considering doing that and leaving his nickname Jase. What are some name besides Jasen that would work for Jase?