This is something that's been discussed on the site several times and never been fully resolved - how should we deal with sites that historically have been several independent entities, should there be a single entry under the modern/generally used name or should each of the original parts be a separate entry?
I think the possibility of an alternate names field has been raised in the past, and I personally think the best way forward would be to have the current overall name for a site as the main entry, with older names or component parts of the site named as alternative names.
Follow the horses, Johnny my laddie, follow the horses canny lad-oh!