Tuvan тос

← Bashkir туғыҙ (cognate)

← Tofa тоһъос (cognate)

← Turkish dokuz (cognate)

← Proto-Turkic *tokuŕ (inherited)

← Western Yugur dohğus (cognate)

→ Shor тоғус (cognate)

→ Yakut тоҕус (cognate)

→ Tuvan тозан (mention)

→ Tuvan тоску (suffix)