Jackster on Family Tree Circles

I believe I am a direct of a John T Fuller who is shown on the 1901 Census as 13 yrs old, living in Oldham and born in March Cambridge. I believe him to be John Thomas Fuller Coward the son of John Fuller (Census) whom I believe to be John Fuller Coward a Bricklayer from March. I am trying to confirm my belief and the origins of the name, but also why it is rarely used.