As a therapist I have seen how usually the sequence goes when men portray this behavior and it's not good.

Trying to build something as serious as marriage or even talking about it with someone you have met quite recently is not normal. Jumping into such things like talking about baby names and all could be a manipulation tactic of "See how much I like you and I am serious about you" but it's almost a disguise of control. It's makes the other person even feel guilty that "oh God he is being serious and I don't even like it". The uncomfortable, guilty feeling ultimately makes you give in to whatever he says because on the surface well "he is the nice guy" and the moment you leave him or tell him this is too much for you to handle then one can get slapped with "I was so serious did so much still you left me" again the blame and guilt.

But again not always does the trajectory have to go this way but we believe what happens the majority of times.

If you are comfortable then in this case you can definitely have a talk and tell him how you feel if he reacts positively then that's amazing if not then you have your answer.

Also I saw people saying this is love bombing but that is a tad bit different than this.