Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Proto-Indo-European *kʷis

→ English who (mention)
→ English why (mention)
→ English when (derived)
→ Old English hwa (mention)
→ Belarusian што (mention)
→ Belarusian хто (mention)
→ Bulgarian що (mention)
→ Breton piv (inherited)
→ Catalan que (mention)
→ Central Kurdish چ (inherited)
→ Central Kurdish چی (inherited)
→ Corsican chì (inherited)
→ Czech co (mention)
→ Czech kdo (mention)
→ Czech nic (mention)
→ Old Church Slavonic чьто (mention)
→ Old Church Slavonic къто (mention)
→ Welsh pa (mention)
→ Welsh pan (mention)
→ Welsh pwy (inherited)
→ Welsh piw (inherited(cy/kw))
→ Danish hvem (mention)
→ Danish hvis (derived)
→ German wo (derived)
→ Lower Sorbian co (mention)
→ Greek τις (inherited)
→ Greek ποιος (inherited)
→ Greek τι (inherited)
→ Greek πόσος (mention)
→ Greek πού (inherited)
→ Middle English who (mention)
→ Spanish quien (derived)
→ Spanish cuan (inherited)
→ Persian چه (derived)
→ Persian که (mention)
→ Persian کدام (inherited)
→ French que (mention)
→ French quoi (mention)
→ Irish cad (mention)
→ Irish cé (inherited)
→ Scottish Gaelic cò (inherited)
→ Ancient Greek τις (derived)
→ Ancient Greek ποῦ (derived)