You need to give us a bit more information. For example, the 1901 Irish census has 316 people named John Beatty (and variants) so without a bit more information we really can’t help you at all. The name is simply too common.
When do you think he was born
Where
Who were his parents
What denomination do you think he was
What else do you know about him eg who did he marry, siblings where & when did he die?