Sforno on Genesis 10:6/ספורנו על בראשית י׳:ו׳

1ופוט וכנען, the sons of Put are not mentioned separately, as they all formed a single nation retaining the name of their founding father. Proof of this is found in Ezekiel 38,5 פרס, כוש, ופוט אתם, i.e. even in the days of the pre-messianic wars of Gog and Magog, Put will still have its original name.