Richard was MILLER in 1841 too
631-17/22
Croft
Richard MILLER 71 Carpenter
Mary 52
Sarah? 14
William 12
John 10
All born Lincs
If there was a name change, it would seem to have been before 1801, as a Richard MILLER was bap in Croft in 1801.
A William MILLINS 65 was living in Skeg in 1841, evidence that the name certainly existed. However, he was possibly buried in 1858 aged 88 as MILLER. I'm not sure what his name was in 1851, but he is to be found aged 82 in a Parish House. In 1841 he was in a "Poor house", so it seems like the same chap.
Richard MILLAR was buried 20 Dec 1853 age 84.