is the mutated form of the Welsh , meaning "big" or "great". The title distinguishes the community from the nearby Llanafan Fechan ("Little Llanafan"), although that village is now more often known as "Llanfechan".
The mutated Welsh term denotes something that is exceptionally big or impressive. It sets this place apart from a neighboring village called Llanafan Fechan, which is now more commonly referred to as Llanfechan.