How to stop characters who have a modded culture from having the surname Smith?

[An Draoidh Uaine]

So I've added a bunch of modded cultures complete with a new dynasty file and I've changed every character effected in the history files as well. My problem is that any new lowborn characters who become landed, are priests, rebel leaders or republican mayors have the surname Smith.

The dynasty names turn up all fine and well in the Ruler Designer, but the AI never gets them.

 

[Sjerrie]

The dynasty names you added, are they set to be allowed for random characters?