Is that an actual Welsh name or did you just jam your knuckles into the keyboard?
"St Mary's church of the pool of the white hazels near the pool"
But, its also kind of a cheat, since the name was established in order to be the village with the longest name for British railway station. - Some early tourist attraction-thingy. The isle of Anglessey has many natural and cultural sites, that are more interesting than railway station with a really long names though.