Hi, I have checked the parts you mentions that had errors and did not find anything wrong with the database. please check the setting and how you imported everything in.
Proof:
The unknown are unknown meaning they have been seen in porn at least once but the exact names are unsure from iafb.com
update
**sorry i just realized you mentions about the same name and and like i said alot of pornstars only use 1 name and no second name. so you could change it like this veronica 1 veronica 2 ... and son on.**
I just want to say the majority of this database is not pornstars with only 1 name its more like. 1% have only one name.