However, when the surname is used without mention of the first name or any title, the de particule is often taken away to avoid repetition. This is always the case where the surname starts with a consonant or ‘aspirated’ h. So, you would talk about “Les fables de L...
In simple patronymic bynames, <INGHEAN mhic> arises when the father's name starts with <MAC>. This is because when a name starting with <MAC> -- such as the given names <MAC Raith> or <MAC Beatha> -- is put in the genitive case and lenited, the <MAC> part becomes <MHIC>. ...