The word “Kykr” is an ancient term that was used back in the feudal age of the world and meant that you were one of the civilised people of the world. You belonged to an “us”.
In the modern age the term is somewhat controversial. With the Kykr civilisation's propensity to murder and enslave anyone who wasn't a Kykr, particularly the dru'un and hessak communities react strongly to the term, as it didn't use to include them. To them it's more a symbol of slavery and oppression than a feeling of belonging.
It is not a term you will commonly hear in civilised conversation, unless it slips someone's tongue. Even to this day, the Kykr have not come up with a better word to describe them as a collective, and whenever it needs to be said in conversation, the speaker can be seen squirming uncomfortably. Most people will try to get around it by using a far more tame "us" than the term itself.