That's fantastic! Samhain is my favorite holiday so I think it's an awesome birthday!
In Celtic times, a huge number of people were born around Imbolc (1 February), because Beltaine (1 May) was a fertility festival that involved people going out and having sex in the fields to inspire the crops to be fertile (actually a good idea, if you read the book The Secret Life Of Plants - science!). Nine months from Beltaine is Imbolc, sooooo ...a lot of Celtic babies born then. XD