Hi Amanda... thanks for your email.
Since our ancestor Hannah married William, we have been unable to find any census entry or detail about them. It could be that the censuses have been transcribed incorrectly but despite variations no trace has been found.
This is our only link to the name of Aish, so consequently we are unable to assist you in anyway as to where the name originated. I have looked at online databases and the name does not appear.
I am sorry we cannot be of any help on this occasion but if anything does come to light I will retain your details and certainly let you know.