Also to add, when we want to refer to "The Name" (ie. the Tetragammaton) in normal speech we say "HaShem" (it means "The Name") so we are not replacing it, just referring to it.
If you mean replacing HaShem with the Hebrew word Ad-nai (please don't use this in casual speech, that's why I'm not writing it out) then you've got a good question. Why did we substitute this particular name/title. Is that what you are wondering?
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