Hi There,
shudall is mainly a protestant surname. Have you tried the wexford Church of Ireland Church St. Iberius, The Rector is Rev. Maria Jansson, The Rectory Spawell Road Wexford. There were Shuddalls in the C.ofI. in Piercestown/Mulrankin Union. This Church was Amalgamated with Wexford Union.
There are also some Shudalls in the Gorey area .
If you contact Rev. Jansson she can assist you and also give you a contact for the Gorey C.of I.
Regards,
Summerhill.