I found this
Peruvian Andean Mountain Native Weapon - Hacha " Cunca Cuchuna | #496332265 (worthpoint.com)
I’m not sure what difference the /k/ makes but I guess the pronunciation is different between inca quechua and the chanka dialect. Like british and american english.
Calling them Kunka Kuchuna with Ks is a nice touch of accuracy imo.
Any idea about how javelineers are called in chanka quechua? Not that it’s necessary… most UUs have their names localized to english anyway.