It is a pagan or heathen custom to address a divinity by their name. Judaism was unique among the ancients not only in introducing a single deity without an image, but to create a religious system in which the less something was used, the holier it was considered.
This went for addressing the Hebrew God by name. By the time Second Temple Judaism was at its pinnacle, Jesus of Nazareth passed on the same tradition to his followers, saying: "When you pray, do not go on babbling endlessly as the pagans (Gentiles) who think they will be heard because of their many words. Do not be like them, for your Father knows what you need even before you ask him."--Matthew 6:7-8.
Gentile religious systems often had the curious belief that required petitions to be offered uttering the proper name and/or titles of a deity lest the prayer go unanswered. Some pagans believed that a deity would not focus their attention on people unless they were addressed by name and that the name was properly pronounced, even if it was in a language uncommon to the worshiper. Long lists of divine names and possible pronunciations had been devised by some in the hope that uttering the list of names would force a response from the pagan god. The repetitions sounded like babbling, which is the word that appears in Matthew 6:7 that gets rendered by some as merely "repeating the same words," which is not the same thing.
Jesus said that such endless babbling of names was not necessary to get God's attention because it was always focused on his creation, so much so that God "knows what you need even before you ask him." Making sure you uttered God's name, pronounced it correctly or used it enough times in a prayer was not necessary.
Holy things in Judaism were generally placed out of sight and used rarely, if at all, by Jews. Hence the Holy of Holies of the Tabernacle and later the Temple was never seen or used by most Jews, even though it was at their center of life. The items within, such as the Ark of the Covenant, and the items in the Ark itself, were not only unseen by most but forbidden to be touched. It is of interest that items associated with God were treated this way in Scripture as far back as the forbidden fruit of Genesis. Though it was constantly present, it was neither to be eaten or even touched. (Genesis 3:3) Most outstanding was the Sabbath, a whole day which because it was holy was not to be used.
For this reason, the Jews to this day rarely utter the Divine Name, if at all. It is their custom to use holy things rarely unlike mundane things which get used frequently, often for various purposes.
It should be added that Jesus followed his instruction on not praying like the pagans with a petition calling for the sanctification or hallowing of God's name, substituting "Father" instead of pronouncing YHWH. (Matthew 6:9) The repetitious use of a deity's name was the opposite of what it meant to treat God's name as holy.
While the name of God is indeed written thousands of times in Scripture, just because something is there all the time doesn't mean one should use it as one uses other more common things, at least for the non-pagan Jews. Again the Ark stood there constantly, the tablets upon which the Ten Commandments were written were inside, the fruit of God's tree in Eden had fruit that could be used as food, and every Sabbath was a day just waiting to be used.
But unlike pagans and worshippers of demons, God's people don't use holy things as one would use a mundane thing, even when it comes to names.