I too thought it odd that TTFL should have missed a chance to say Kettle!
I imagine that this is the same young man (19?) that I saw on the line at Melton Town (very close to his home!) in September 2018,listed as Michael. A little research reveals the birth in 2000 in Slough of Michael Zachary Kennard-Kettle. A further check shows that in the final quarter of 1993, in Plymouth, Deborah M A Kennard married Trevor M Kettle. I would guess that answers Mackem's question. Two other births with the same surname are listed - one in Shrewsbury in 1998, one in Salisbury in 1996.
Well given that Trevor Kettle was originally located as Berkshire when he joined the league list, I think your research might have been correct.
If I was young Zachary, I might have been tempted to take my mother's name into my refereeing...