The village gets its name from the Dún, meaning doon, and Síon, meaning weather'. There were battles fought on the famous Doon, which is accessible by walking through the fields. There are many fairy forts in the fields which hold great significance, as people used to live there long ago; there is a great sacredness about these forts.
The population approximately 25 people. The main language in the village is Irish but many have adapted and now speak English also.The various families worked the land and still continue to do so till this day.
The renowned beach boasts tremendous views of the village Kinnard in the neighbouring parish of Lispole. The "Siorrach", meaning foal, is a seastack which can be seen from the beach and is said to resemble a foal. The "Trá Bheag", meaning small beach, runs along the picturesque beach until it meets the sea. There are many small fishing boats moored on the stream in which the Dún Síon residents used to fish in the earlier times and where the women would enjoy picking cockels and mussels.
Many of the residents own cows or cattle, and it is said that cows outnumber humans 6:1.
- "Dún Síon native and legendary GAA commentator Mícheál Ó Muircheartaigh announces his retirement". The Dingle News. 16 September 2010. Retrieved 16 September 2010.