The names is Stanislau on the baptism and Stanisland on the birth certificate. Iam trying to find if there is any connection and have looked for someone with that surname from Wexford but with no luck yet.
I would have to disagree with you on the spelling, and agree with Dathai.
- On the civil registration, the name is clearly Stanislaus. I think you are being mislead into reading it as Stanisland by the fact that the final letters overlap with the bottom loop of the cursive capital F in "Female" in the following word.
- The baptism entry is less clear, but I think it ends on a form of cursive s.
Also, Dathai is correct that this is a Christian name, so I don't think you will find anyone with that name as a surname in Wexford.