Corpus of Electronic Texts Edition
The Destruction of Dind Ríg (Author: [unknown])

paragraph 6

After that, Cobthach took the realm of Leinster. Now Ailill of Ane had left a son, even Móen Ollam. Now he was dumb until be became a big man. One day, then, in the playground, as he was hurling, a hockey-stick chanced over his shin. ‘This has befallen me!’ says he. ‘Moen labraid’, ("speaks") say the lads. From that time Labraid was his name.