I actually went through several names when I was planning it out. Tsar was the only name that really 'Stuck Out' and felt right for it to me. Sickle seemed too cliche'd.
Anyways Thunderer, I doubt the gun(s) will be usable ingame as it does tend to be alot of work balancing fwrd guns, for now it's mostly for RP and to help build the Hurricane's background.
Not everything in the Coalition has to be named after something in the Soviet Union. Or even modern China.
Anyways that's all I really got for this right now. *shrug*