For the past few months, Aaron has been obsessed with singing "Samuel Tells of the Baby Jesus". We were certain that we were having a girl, so we were focused on girl names. Back when we were figuring out Aaron's name, we called him Samuel for a day. It felt good for only that day though. We had Samuel ready just in case we were wrong. I immediately started calling him Samuel as soon as the doctor laid him down on me.
Aaron and Lucy were ready to call him Samuel since he's been singing about Samuel for months and months.
A few weeks later, we realized Aaron did the same thing with Lucy. As Aaron started learning words, he would frequently make sounds that were similar to yodeling. It sounded like loo dee loo dee loo dee loo. When Lucy was born, we started calling her Lulu since we knew he could easily say that.
So, even months before his siblings have been born he knows their names and sings them over and over and over again. He's two for two at this point.