Congratulations Ella! Wow what a surprise. They will be the best of friends though...i can already see the brotherly bond between my 2 boys (almost 10months and 2.5year old)- i can see it when they look at each other.

As for names...

I think Sebastian goes really well with Orlando, as well as being a nice name too.

Also what about Oliver being that one of your girl options was Olivia.

Goodluck. I look forward to seeing your decision soon.