Quote Originally Posted by Pioner
I have no idea how to name sais in Russian
Probably сай (m., pl. саи), but I only saw it once.

Japanese weapons are very unlikely to have a native name in Russian anyway, though. So simply take the Japanese word and transliterate.

Just make sure to read this before you do:

http://www.susi.ru/SusiOrSushi.html

Double transliterations (Japanese -> English -> Russian) like "шурикен" give me the creeps.