Solved. Things are much more easier than I thought.
1. Take cloner tool, use it on NPC. In opened dialog remember "tab" and "name" parameters, choose server side and save.
2. Now just
world.spawnClone(x, y, z, tab, name)
e.g.:
world.spawnClone(90, 109, 465, 1, 'Ristai')