My girlfriend has the same birthday our dads have the same name and both have lost brothers with the

I don't see what the question is, but it certainly seems worthy of a comment. Most would class it as an amazing coincidence. There is an explanation, IF you believe in reincarnation. That is that there are grouping of Souls that tend to reincarnate at similar times into earthly relationships so they can experience different forms of such relationships.

For example somebody my now be the mother of their previous grandfather. Ecen so the coincidence of names is remarkable and is an illustration of the complex workings of Destiny.