Somehow I missed this one also from Gresford. He mentions his neice Elizabeth Dovey.

Usher, Reginald, Gresford, Denbigh, Farmer
Reginald Usher : will, 1792.
http://hdl.handle.net/10107/884797These are the only others in the Welsh Wills I can find, could be linked.

Usher, George, Llanrhaeadr, Cross Foxes, Llanrhaeadr-ym-Mochnant, Denbigh, Innkeeper
George Usher : will, 1836.
http://hdl.handle.net/10107/596787Usher, George, Bron-y-garth, St Martin's, Salop, Butcher
George Usher : will, 1837.
http://hdl.handle.net/10107/464132Usher, Thomas, Llangynog, Montgomery, Miner/Yeoman
Thomas Usher : bond, 1738
http://hdl.handle.net/10107/760970Usher, Thomas, Llangynog, Montgomery, Shopkeeper
Thomas Usher : bond, 1788.
http://hdl.handle.net/10107/82987Usher, William, Fernhill, Whittington, Salop, The Elder/Yeoman
William Usher : will, 1810.
http://hdl.handle.net/10107/833305