I love
Isidora, this spelling. You are so right about the second "i" because it's the feminine form of
Isidore. (Sticklers unite! We have nothing to lose but our pains!)
I still like
Izzy as a nn. How about Iddie? Dorie?
Dodie?
Sid? Sidra?
It's just a hop, skip and a jump from
Jethro to
Arlo. . . .