1841 census gives a Morris Pugh living at Upper Mill Street, Garthgynfawr, Dolgellau with parents Richard and Ann Pugh
1851 census. The only obvious Morris Pugh of the right age is working as a groom at and place of birth given as Celynin, Merionethshire
Celynnin is in the parish centred on Llangelynin between Tywyn and Dolgellau in Merionethshire. Celynnin falls within the registration distict of Dolgellau"Celynin is in the Township of Bodgadfan, according to census entries of 1841 and 1851.
There are 2 Richard Pughs living in Llanegryn in 1841, but neither has a son Morris.So that still leaves open the possibility that this Morris came from the 1841 census for Richard & Ann in Dolgellau.
Richard Pugh born about 1781, living at in 1841 census - Llanegryn, Merionethshire
Richard Pugh 60
Marry Pugh 65
Hugh Pugh 45
Margaret Pugh 40
Gwen Pugh 20
Margaret Pugh 15
John Pugh 14
Marry Pugh 11
Griffith Pugh 10
David Pugh 8
Hugh Pugh 6
Elizabeth Pugh 3
Richard Pugh born about 1776 , living at in 1841 census - Llanegryn, Merionethshire
Richard Pugh 65
Ellin Pugh 70
1853 "our" Evan Pugh marriage is witnessed by a "Morris Pugh", whom we would assume to be a relative of the groom.
After that I can find no mention of Morris Pugh in any of the 3 following censuses. Oddly there is a death in Dec 1900 of Maurice Robert Pugh aged 64 in Dolgelly Districe 11b 251. But no mention of him in any of the previous censuses.