This is the 12332nd most frequent Russian word.
казахстанец
A "казахстанец" is a Kazakhstani, a citizen or native of Kazakhstan.
Here, 'казахстанец' indicates the nationality of my friend, specifying he is from Kazakhstan.
Мой друг — казахстанец.
My friend is a Kazakhstani.
The term 'казахстанец' is used to describe the origin of the person presenting at the conference.
На конференции выступил казахстанец, который рассказал о культуре своей страны.
A Kazakhstani gave a speech at the conference about the culture of his country.
This usage of 'казахстанец' identifies one of the tourists in the group as being from Kazakhstan.