I don't know if the first record(s) are relevant or known,but on FamilySearch there is a record for William Searby born 1840 Lincolnshire in prison in Dublin.One variant of the record has him in a female prison(!)and there is a slightly later record of a Mary Manning(only 15 in 1864?) in the same prison.There are a number of other variants on the name and age that look like different people.
Of more direct relevance there is a Latinised(presumably Catholic) christening record for Carolum(Charles) parents Gulielmo(William) Serby and Maria Manning 1874 in Buffalo,Erie,New York
Regards
Roger