Hashi.
Fun speculation (no facts as to connection):
Is the name related to
Hashish?
Between 1000 and 1200 AD, the stories of hashish use by assassins in Persia arose. Some scholars claim that the name “hashish” traces back to the word for “assassin.” Whether true or not, by 1300 AD, Marco Polo had heard stories about hashish-using assassins and took these tales back to Europe with him.
You have it backwards. The word “assassin” comes from men who would get high on hashish and then go commit murders. The original term I believe is “hashhashim”.
CC
that group were known as hashashin and they were murderers for hire or the terrorists of their own day. fyi