What are Caitlyn and Jayce's last names?

Pretty sure modern people have last names.

[{quoted}](name=George LS,realm=EUW,application-id=6kFXY1kR,discussion-id=AMUVdiYY,comment-id=0000,timestamp=2015-11-28T15:08:37.571+0000)

Not many characters outside the three big human capitals (noxus, demacia, bilgewater ) have a second name, champions like fiora, vayne, swain and katarina are well known or are members of great families, i think piltover is just too modern for second names, giving a second name to vi or jayce would ruin they personas leveling them down to the level of an ordinary real life man, the second names on guys like fiora or xin zhao from the other hand don't harm all that mystery going on around them as they resemble the warriors and heroes of the real life past.

Name is Cecil, his last name is Heimerdinger, so you can add a yordle to the list.

[{quoted}](name=George LS,realm=EUW,application-id=6kFXY1kR,discussion-id=AMUVdiYY,comment-id=0000,timestamp=2015-11-28T15:08:37.571+0000)

Not many characters outside the three big human capitals (noxus, demacia, bilgewater ) have a second name, champions like fiora, vayne, swain and katarina are well known or are members of great families, i think piltover is just too modern for second names, giving a second name to vi or jayce would ruin they personas leveling them down to the level of an ordinary real life man, the second names on guys like fiora or xin zhao from the other hand don't harm all that mystery going on around them as they resemble the warriors and heroes of the real life past.

So um...how many people in Piltover are named Jayce then?

Are Piltovian names 1 of a kind?

Actually...you've got it backwards. Whereas it's a fairly common modern thing for people to have surnames and middle names, in the ancient past this was not so. Seeing as Piltover is "the world of tomorrow" I would think it would have more modern naming conventions.

http://tvtropes.org/pmwiki/pmwiki.php/Main/OnlyOneName https://en.wikipedia.org/wiki/Mononymous_person

In some places, surnames never really caught on such as in Iceland, and Finland -and in other places like The Netherlands or Turkey not until invaders or political changes introduced them.

Obviously the OP.