Is this normal or am I just crazy? (Long post)

First of all, I'm sorry if this isn't in the right place, wasn't sure where else to put it.

So I had this grandpa. Well, this grandpa died in 1987. I was -4 at the time. (Yes, you read that right. He died 4 years before I was born). My grandmother remarried when I was very young, I don't remember exactly; I may not have even been born yet then. So all my life I knew this other grandpa as my grandpa, and he was a great one. I never thought twice when I was a kid about not knowing my biological grandpa.

But as I've grown into an adult, I've begun to feel more of a connection with my bio grandpa. It's become even more strong lately. I don't really know how to explain it other than I just miss him. I kind of feel at times like I can feel his presence and his love. But I would have no idea what that feels like because I never knew him. But it's just such a strong, almost overwhelming feeling at times, and I'm so confused. I could understand feeling this way if I had ever met him or had a relationship with him, but o never did. I feel more connection with him than I do the grandpa that I actually grew up with and have loads of amazing memories with. But my bio grandpa still continues to have such a strong impression in my life, it's gotten to the point where I can hardly bare the thought of the baby I'm expecting being a girl instead of a boy (we won't know which it is until next month) because I want so badly to carry on my grandpa's memory and legacy by naming the baby after him. I just don't know what I'll do if it's a girl, I have absolutely no name ideas for a girl. I almost feel like I need to name a baby after him in order to get some release from this almost overwhelming feeling.

Don't get me wrong, it can be nice at times. But there are other times when I just about shut down because it's so strong and I miss him so much I don't know what to do. I've never felt anything like it before, although I have lost grandparents that I had memories with; and while I miss them dearly, it's just nothing like this. Anyway, I'm not sure really where I'm going with this. I just needed to get it off my chest, mostly, and see if maybe anyone had any similar experiences or if I'm just flat out crazy. Any thoughts or ideas, similar experiences?