are you sure born 1819 - the James G born in Lonan that year died in that year.
A james born to John G + Cath Cooile bapt 1818 as also a John Joseph who died in 1819 with a later John (bapt 23 OCT 1822 st math) to same parents

also remember to check 'gellin' as this does not map to same soundex and I have seen this name used tho not freqiently