Ó Cléirigh is a name that belonged to a family in Ireland a long time ago. They were very important because they were very good at keeping track of important things that happened in Ireland. They wrote them down in big books called annals, and these books were very helpful for people who wanted to know about the history of Ireland. The people in the Ó Cléirigh family were very smart and worked very hard to make sure they wrote down everything that happened. They were like reporters, but instead of reporting news to people, they wrote it down so that future generations could learn about what happened in Ireland a very long time ago.