I would guess, since it has been rebranded on christmas day, that it's named Dear ImGui because when you would write a letter to Santa Claus, you would start by

I would guess, since it has been rebranded on christmas day, that it's named Dear ImGui because when you would write a letter to Santa Claus, you would start by "Dear Santa" (or at least in french, "Cher père Noël"). Maybe a parallel is to be made between the library and Santa Claus, because if you ask for something kindly, you would magically have it, without it being cumbersome for you.