Found in Version:
As discussed a while back on the forums and more recently on IRC, 'lord Indoril Draler Ilvi' is going to generally be referred to as 'the Indoril Ilvi', the name 'Indoril' effectively acting as a title in and of itself, and 'Ilvi' being the name of whoever rules Roa Dyr. While Indoril Draler may have been the birth name of Ilvi, it would only appear rarely if at all.
To that end, there are two references to 'Draler Ilvi' in Tamriel_Data which should be edited at some point. One in the book 'Formalities of Mirth', written by Ilvi, and the other in the White Book. The latter will probably end up getting adjusted either way as work on House Indoril moves forward.