Very lovely name, a Norman import into the British Isles, especially Ireland.
I love Honor as well, but more in the mn spot. I think Sofia (on these boards) was surprised to see Honor (that spelling) in a recent Britsih BA - it always has been spelled that way here, long predating the fixed spelling of the verb/noun "honour".
Not so fond of Honoria - I think the -ia ending is overdone.
Honora is perfect!