I suspect this might easily become a pet peeve if it spreads.

[oneiriad]

So, I was reading an (admittedly, not particularly good) Vikings fanfic and suddenly, a character addresses Lagertha as "Lagertha Lothbrok", and a little later, the same character addressed Rollo as "Rollo Lothbrok".

This is what I get for daring to venture into the pit of voles, isn't it?