Clontarf was named after a town in Ireland, near the capital of Dublin. You can read about the history of Clontarf, Ireland here.
It is interesting that Clontarf was chosen for the town’s name. Before the town was platted, it was called Randall. When Bishop Ireland, acting as land agent for the St. Paul and Pacific Railroad (James J. Hill), decided to establish a Catholic Colony on the land, he must have chosen the name in light of who settled. Many of the earliest settlers to answer Bishop Ireland’s call were Irish Catholics from the East Coast of the United States.
I wonder if there are any other towns in the US named Clontarf? Do any Clontarf natives have any stories or memories of the name Clontarf? In the bigger scheme of Minnesota towns, it might seem unusual, but among the surrounding townships (Tara, Dublin, Kildare) it makes sense.