It is always great to speak the Father's name with respect. We are told "Our Father Who are in Heaven hallowed" or holy, set apart "be your Name." But what is His Name? Is it God, G-d, Dios, Jehovah or many of the other names He is given in different languages?
Well, He gave His Name to Moses at the burning bush. Ancient Hebrew documents spell it with the consonants YHWH. Since vowels were left out, there is dispute on how it is actually pronounced. My research leads me to believe it is pronounced "Yahuah."
Also, nowhere are we ever told it is not permissible to say His Name. In fact, it is spoken thousands of times in the Bible by many prophets and saints. Messiah spoke it.
When you see "the Lord" in English Bibles, well that tradition started pretty much with the St. James Bible's translators. They had the real name available to them in their ancient documents, but chose not to use it, maybe because they thought it was too "Jewish" or something. So they substituted the real Name with "the Lord."
You might want to do a research on the Name of not just the Father but of His Son. (And btw there is no J in Hebrew so Jehovah and Jesus are not true names for Deity.)
I personally found the Messenger of the Names vids on You Tube to be very scholarly and logical and Biblical, though you have to get past the guy's rather off beat clothing.
If we are not sure how to pronounce His Name, well at any time it is find to say "Abba."