If i spoke a language i didnt even know the name of?

God gave us all different gifts. The gift of tongues is different than the gift of interpretation of tongues. You may speak it, but not know what is said. You don't need to know. You will never speak it without a person that has the gift of interpretation of tongues present. It is rare and many people profess to have spoken it, blasphemers. God has his reasons for doing it this way, possibly for the sake of the unbelievers.