There are no descendants in Stradbally with the Flaherty surname, but no doubt there are some local people who are related. The only family of Flahertys to live in the parish in recent years that I'm aware of (my own) are no relation.
There is one Flaherty grave in Stradbally with an inscribed headstone that I'm aware of, in the SE corner of the old / CofI graveyard. The headstone is inscribed thus:
IHS / Erected by James Flaherty in memory / of his Wife Margaret Flaherty who depd. / this life Jany. 28th 1818 aged 57 Yrs also / his Father died Augt. 9th 1812 aged 79 Yrs
Best of luck with your research.