Here’s a test to see if you are praying in his name.
1. If you are praying in His name you will receive regular answers to prayer.
2. If you think you are praying in His name and you are not living according to His will then you are not really praying in His name.
3. If you pray for a certain thing “in Jesus name,” and as you are praying your prayer seems to die on your lips, then do not continue; for it is not in His name. As Duewel writes, “Any prayer that is selfish, vindictive, or with wrong motives dies on your lips when you take His name.”
4. Ask yourself this question: “Can I stay focused on God while I pray for the things I desire?” If you cannot, that is, if you hold those things up, in your mind, next to the glory of God and you find that you are naturally more focused and affectionately drawn toward those things and less focused on the glory of God, then what you are asking for in prayer is not in His name. It is an idol.
Prayer A to Z 
Perhaps it shouldn’t, but it bothers me when Christians conclude prayers “in his name” or “in your son’s name.” It’s a pet peeve of mine. His name is Jesus. I wonder if unbelievers listening in on a prayer even realize in whose name the prayer is being offered. Why do Christians conclude their prayer in that way? Are they embarrassed to pray “in Jesus’ Name” or are they afraid they might offend someone in the audience by saying Jesus’ name out loud? “In Jesus’ Name we pray, AMEN.”