Irish, English:

1. descendant, son of sorrow; descendant, son of tear-drop; & diminutive suffix. Sindarin: masc. Demegion, Naeregion, Núregion ‘son of {diminutive} sad{ness}’; masc. Níregion, Nínegion ‘son of {diminutive} teardrop’

2. prince. Sindarin: Ernil, Cund; masc. Ernilon, Ernilion, Cundon, Cundion
3. form of BRENDAN