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 *éy

→ Welsh hwy (inherited)
→ Welsh ef (derived)
→ Danish nul (mention)
→ Irish a (derived)
→ Irish é (inherited)
→ Ancient Greek εἰ (derived)
→ Ancient Greek ὅς (mention)
→ Ancient Greek ἰός (mention)
→ Ancient Greek ἔνθα (mention)
→ Ancient Greek ἔνθεν (mention)
→ Manx eh (inherited)
→ Hittite 𒄿𒉿𒅈 (inherited)
→ Icelandic núll (mention)
→ Kalasha ayá (inherited)
→ Latin is (derived)
→ Latin ibi (derived)
→ Latin ita (cognate)
→ Latin item (cognate)
→ Latin ipse (mention)
→ Latin idem (mention)
→ Latin iterum (mention)
→ Latin ec- (derived)
→ Lithuanian o (mention)
→ Lithuanian vienas (mention)
→ Lithuanian jis (cognate)
→ Lithuanian niekas (mention)
→ Latgalian jis (inherited)
→ Latvian viens (mention)
→ Latvian jau (mention)
→ Norwegian Bokmål a (mention)
→ Norwegian Bokmål nullpunkt (mention)
→ Norwegian Bokmål absolutt nullpunkt (mention)
→ Norwegian Bokmål aberdeen angus (mention)
→ Punjabi ਇਹ (derived)
→ Punjabi ਇਸ (derived)
→ Russian а (mention)
→ Sanskrit इव (derived)
→ Sanskrit अयम् (inherited)
→ Sanskrit एतद् (derived)
→ Sanskrit इदम् (inherited)