I agree with Martin—looking again at the 1735 register, that is clearly William rather than John. It’s a great catch and interesting to see him as part of the broader Bucknall Forrester/Foster group. This likely places him as a son of the elder John and perhaps a close relative (brother or cousin) to the John of Launders Bank. Other key members of this early Bucknall cluster include the Henry buried in 1756 and Isabella, daughter of John and Mary of Bagnall.
Regarding the names Jarvis/Garvis and Emanuel, the onomastic evidence we’ve found—meaning the use of rare naming patterns as a genealogical marker—strongly suggests a direct lineage that transcends surname spelling variations.
Effectively, these names act as a 'family signature' anchoring our Bucknall branch to the ancestral Moorlands clan. Unlike everyday names such as John or William, Garvis and Emanuel serve as distinctive markers that help us track this specific family through the records.