This is interesting. I have an experience that is not the same (but, I have a friend whose brother told her that he always wanted to know "Where is my brother?"; and it turned out, neither knew this till much later, that he had been born a twin, the twin died at birth and was never mentioned by the family)
My own experience is more about seeing two people in one (in a soul-wise sense). When my son was born and I was changing his diaper, I suddenly felt strongly, inexplicably that he was, in some way also my brother (my brother was alive at the time and out of touch, there wasn't a resemblance I saw or anything but this sudden internal certainty---and I am not religious in any sense---my son is near 30 now, my brother dead, and I still (and did as he grew up) have the same feeling (it isn't as strong now, but throughout his childhood I had an unreasonable fear of calling him by my brother's name (my brother, years later killed himself and I felt somehow Very relieved I had not let my tongue slip although they often became confused in my own mind, never even told his dad, and never wanted to tell anyone; I think it was the not wanting to tell anyone that was "telling" for me, something about it felt strange and yet very real). One thing I tell myself is that we really are all one in a sense, from the same ancestor, stardust, the offshoots of an original primordial something...and it makes sense that as we have physical commonalities, we could also share spiritual, emotional, unconscious commonalities---(think of Jung and the collective unconscious --- and how disparate societies share, in different forms, the same kinds of rituals, roles...)
Maybe it is like (I do go on) semi-permeable membranes; information can be passed in one direction or another...but I believe what you feel is Real, however it occurs, and the name was there somehow, preverbal, but there for you...
I think it would do no harm to embrace this feeling and be called Andy....and to explore the feeling, the experience. Whatever it is, it is Special, a kind of gift. Now, I am going to check out the info Mimi posted....