Well, in all fairness, you don't have to run a 37" tire with a 3" lift. In fact, there's nothing stopping you from running it with stock tires only, your Jeep will look like a roller skate
I think there's a lot of misunderstanding when it comes to tire sizes and even more so with metric tire sizes. If you want to run a metric equivalent of a 35" tire, what you really need to be looking at is a 285 or at most, a 305. A 315 will have an actual size that is about 35" but again, that would be the same as an advertised 37" tire.
There's only one time where actual tire size should matter and that's when it comes to calibrating your speedometer. Of course, even then, the best way to do that is to measure from the center of the wheel to the ground and x2. This will be about an inch less than what you would get if you measured to the very highest point of your tire.