From Proto-Mongolic *toxala-, compare Dongxiang taola.
Equivalent to тоо (too, “number”) + -лох (-lox).
тоолох • (toolox) (Mongolian spelling ᠲᠣᠭᠠᠯᠠᠬᠤ (toɣalaqu), causative тоолуулах, passive тоологдох)