Sadly no i don't know where James Michael Austin Courtenay was born in Ireland, i only have him on 1841 & 1851 census stating Ireland,he died in 1858 in Brighton.
the Austin part of his name carries on through the family to present day.
He and his wife only have one son John Kell(e)y Courtenay born c1830 which would make his mother approx 19 when he was born, she pre-deseaced her husband,so i am assuming i am looking for a marriage in Ireland some where between 1825-1830,as i can find no trace in London and surrounding areas.