Revoking the talaaq after the second divorce

Q: I follow the hanafi madhab. I divorced my wife one time and then I went back to her by just uttering the words I take you back as my wife then I divorced her a second time after a few days and then I went back to her by just uttering words I take you back and accept you as my wife. Recently a friend of mine told me that I can't do that. After the second time I must have an imam and witnesses and marry her again the way I first married her. I am worried now. I have already divorced her for the third time now but I am concerned that when I became intimate with her after the second divorce did I fall in sin?

The name Feroz and Feroza

Q: What does a boys name Feroz and girls name Feroza mean? I was told it's not permissible to keep a girls name Feroza and boys name Feroz,is this true? If yes will it be compulsory to change the name if the above names were kept and is it a sin if the names are not changed?

The importance of Salaah

Q: I want you to tell me some waizfa so that I can become namzi. In ... I used to offer prayer and recite tasbeeh, but since I came to ... I hardly offer prayer. Please I am really worried. Every night I promise myself to pray but during the day I don't end up praying. Please give me some dua?