Hello there,
came across your question and I have the answer for you.

It is Irish although a bit butchered (no pun intended) a lot of old Irish
words, places names etc have changed over hundreds of years.
For example place names. Listowel a town in Co. Kerry.

The right name is Lios Tuathail. In Ireland a ring fort depending on the
county you are in are called ringfort, Rath, cathair, or Lios.

Tuathail is Irish for Toole / O'Toole. So the large ringfort in that area
was more than likely the seat of the local head the ball.

So it is O'Toole Lios, a statment of his authority, but the meaning
pronuncation and spelling has been lost and is as you see it
today on the map as Listowel.

As for the Foilnamuck it is this.
"The Blood of the pig"

To say it in Irish "Fuil na Muic"

Anyway thats my contribution on my first post.

All the Best,
Cloch Mor.