Iona is an island of the Inner Hebrides, Scotland. In 563 Saint Columba founded a monastery here, and from here Christianity spread to the rest of Scotland. The monastery survived until the Reformation.
Iona also became the burial site for the kings of Dalriada and their successors, the early kings of Scotland.
There is also a software company called IONA Technologies PLC (http://www.iona.com/). The company headquarters are in Dublin, Ireland.