Well, colour me surprised! I thought this was a Mexican / Spanish word! Honcho Definition & Meaning - Merriam-Webster:
A relic of the large U.S. presence in Japan in the years following World War II, the word honcho comes from the Japanese word hanchō meaning “leader of the squad, section, group.”

So did I! Then again, I never was a head honcho while in the army. That distinction fell to others.