Thank you so much for jumping in and helping Trevor out, Brian!
As Brian said, finding your ancestors' location before they left for the US could be a huge help. According to the johngrenham.com website, the Bowe surname was common in county Kilkenny.
Another option would be to look at
ship records. The county of origin of your ancestor may be in here. Here are some more
genealogy resources to help you with.
Edit : I just saw that you found a location, that's amazing! Let us know how your search goes. :)
Best of luck!
Antoine