Adorable.
Love the name you want to call him. My uncle's given name is Donald, but we all call him Bubs or Bubbie ... comes from when he was a baby and his oldest sister said, "Don's making bubs again, mommy!"
And my grandson calls me Bubbe (pronounced Boobie, with the "oo" as in "book", not "boob"), which I believe is Yiddish for Grandma. So call him Bubbie ... and love him to pieces, 'cuz you can alway smake a quilt with those pieces! Yay!