Daniel would fit - there is a will for Daniel Gawn (Jurby 1763) on Manxnotebook which implies that Thomas is eldest son (an earlier child John is presumeably dead) - there appears to be no will for Cath Stephen his wife. Male marriage at 28 is about the norm.

If Daniel held land then any transfer of land to his son should be found.

Was the bible record contemporaneous with the parties or a later addition (the addition IoM England) would seem to imply a much later IGI based addition