down in weekly themes, Emanuela made these comments

...My question is: why so often English writers misspell Italian names in double letters?
Even my name Emanuela is very very often written as Emanuella, and I cannot figure out why.
...
Just a curiosity:
We call Principe azzurro your Prince Charming - I suppose because he wears a sky-blue cloak


So what are the general rules for double letters?

i think that Emanuela becomes Emanuella because of the the English name of Ellen/ with its Ella diminutive. (sometimes even my name gets written as Hellen, by people who are sure its just Ellen with an H at the front.

there is also Cinderella, (and i think in the italian she is cinderela, single ell.)

and the Double z while not unknown, (drizzle, fizzle, pizza) is not common.
and her second point about prince charming be named for his blue cloak-- i thought that was too interesting to be buried.