English word unanimous comes from Latin unum, Latin animus (Courage, will. Mind, soul, life force.)

Detailed word origin of unanimous

Dictionary entry	Language	Definition
unum	Latin (lat)
animus	Latin (lat)	Courage, will. Mind, soul, life force.
unanimus	Latin (lat)	Concordant, harmonious, unanimous (that acts as one).
unanimous	English (eng)	Based on unanimity, assent or agreement.. Sharing the same views or opinions, and being in harmony or accord.