I have two adult skids that have young children. They insist on referring to us as Opa (granddad in Dutch) and 'my name'.
One of the grandchildren has started calling me by my first name now, which bothers me, because I would like to be known as Oma (grandma) and not by my first name.
Even if it's Oma + my first name, it would be fine.
I feel that it not only is improper for a young child to call an elder by their first name only, but it is divisive to only call the grandfather (my husband) Opa , and me by my first name.