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Old Norse sex
← Old English siex (cognate)
← German sechs (cognate)
← Middle Dutch sesse (cognate)
← English six (cognate)
← Proto-Germanic *sehs (inherited)
← Old High German sehs (cognate)
← Gothic 𐍃𐌰𐌹𐌷𐍃 (cognate)
← Ancient Greek ἕξ (cognate)
← Proto-Indo-European *swéḱs (derived)
← Dutch zes (cognate)
← Old Frisian sex (cognate)
← Old Saxon sehs (cognate)
← Sanskrit षष् (cognate)
← Old Armenian վեց (cognate)

→ Old English siex (cognate)
→ Danish seks (derived)
→ Faroese seks (derived)
→ Old Danish sæx (inherited)
→ Old Swedish sæx (inherited)
→ Old High German sehs (cognate)
→ Gothic 𐍃𐌰𐌹𐌷𐍃 (cognate)
→ Interlingua sex (derived)
→ Icelandic sex (inherited)
→ Norwegian Bokmål seks (derived)
→ Norwegian Nynorsk seks (derived)
→ Old Norse sextigi (suffix)
→ Elfdalian sjäks (derived)
→ Swedish sex (derived)