This ScienceAlert article, which republishes an article from The Conversation written by Caleb Everett (the son of the linguist Daniel Everett) makes the claim that "hand" is etymologically related to "five" in many world languages.
Proto-Indo-European was decimally oriented because, as in so many cultures, our linguistic ancestors' hands served as the gateway to realisations like "five fingers on this hand is the same as five fingers on that hand".
Such transient thoughts were manifested into words and passed down across generations. This is why the word "five" in many languages is derived from the word for "hand".
However, this does not appear to be the case, at least for the languages I know these two words in, most of which are Indo-European in origin:
German: Fünf, Hand
French: cinq, main
Spanish: cinco, mano
Chinese: 五， 手
Greek: πέντε(pente), χέρι(cheri)
Is there any known etymological relationship between these two words in any other language (Indo-European or not), or is the author's claim incorrect?