That was a simple concession. Don't concede so easily, GreatWyrmGold. Show some backbone! Here I will lend you some of my Totems.
Urist shows up more commonly based on the available population sizes, civilization numbers, and successful breeding, all of which can be set during worldgen. Less savagery can and does increase breeding. However, Daggers, themselves, being found cannot be preset during worldgen themselves directly, without removing Kobolds, via their caves.
It is also quite possible, that a larger world, 256, lets say. A 256 world might just have a larger population and thus have a decidedly larger chance of a densely packed mountainhome of migrants with Urist for their firstnames. Unlike the chances of daggers showing up.
This said. It would also be conditionally less likely for daggers to appear having the closest neighboring neighbor not be a dagger wielding race. But with that being said, not so often enough, it is also likely that if Elfs were enemies, that they could infact, quite possibly forge a wooden dagger, could they not, should one want to? While quite unlikely and to my knowledge, unavoidable, it could be said that this would possibly occur, possibly in concurrence with another parallel occurring event.
With these variables in mind, the likely hood of one being more random than the other could be swayed, but may not be swayed to prove a more fruitful if desired result; yielding higher chances of daggers and Urists for a specifically prescribed embark choice, seeds being what they may.