Hello,
On the 1841 census there is an Evan Hopkin listed as 39 years old and an ag Lab. with him are Mary age 37, William age 9, Mary age 7, Ann age 5 and John age 3. The address appears to be blue street, Wick.All listed are born in Glamorgan.
On the 1851 census Evan is listed as 49 years old and still an ag lab. Place of birth is given as Newton. Mary age 47, Cecil age 4 and Rachel age 18 months, who were all born in wick.
These are the only possible matches i could find.

Best Wishes,
Paul.