The names Johanna and Judith are interchangeable and were variations of the Gaelic name Sioban. There were two Judith Ronan's born in 1809 to whom I believe are brothers. Kieran Ronan and Catherine Murphy had a daughter, Judith, bap. 28 May 1809, St. John's Parish, sponsors, Dominic Croak and Catherine Ronan. John Ronan and Anstice Croak had a daughter Judith, bap. 10 Sep 1809, St. John's Parish, sponsors, Dominic Croak and Catherine Ronan m. Michael Barret 27 Feb 1843, St. John's Parish. I believe that Judith, daughter of Kieran Ronan and Catherine Murphy is the Judith Ronan who married Patrick Sinnott.
Anstice Croak is my 2nd great grand aunt and Dominic Croak is my 2nd great grand uncle and married Mary Ronan 3 Jun 1810, St. John's Parish. I believe that Mary Ronan is the sister of Kieran and John Ronan, their parents unknown. Anstice/Anastatia Croak, daughter of Dominic Croak and Mary Ronan, emigrated to Australia m John Robert King. They emigrated to the US and lived in California.
The baptism record for Mary Sinnott shows a Michael Croak as a sponsor. This may be the Michael Croak, son of Dominic Croak and Mary Ronan, b 1812 and 1st cousin to Mary Sinnott.
There may be other members of the Croak and Ronan families that emigrated to Australia. My great grandmother Ellen Croak Dunn emigrated to the US in 1849. The realtionship between the Croak and Ronan families is a a work in progress.