I have the family Bible dated 1603 of a family called Harmston(e). The entries begin with the marriage of Thomas Harmstone and Anne Warner [? I am not sure that I have read her name correctly] on 28th July 1619 and proceed with the baptisms of Jane, Anne, Thomas, Elizabeth and another child whose name I cannot read, between 1620 and 1628.
There is no indication of where they lived.
I will gladly provide digital photographs of the inscriptions for anyone interested in this family or surname.
Abergynolwyn