Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Proto-Turkic *ẹk(k)i

→ Southern Altai эки (inherited)
→ Northern Altai ыйи (inherited)
→ Azerbaijani iki (derived)
→ Azerbaijani əkiz (derived)
→ Bashkir ике (inherited)
→ Bashkir игеҙәк (inherited)
→ Bashkir икенсе (inherited)
→ Bashkir икәү (derived)
→ Chagatai ایكی (inherited)
→ Shor ийги (inherited)
→ Dolgan икки (inherited)
→ Khakas ікі (inherited)
→ Kazakh екі (inherited)
→ Karachay-Balkar эки (inherited)
→ Kumyk эки (inherited)
→ Kumyk эгиз (derived)
→ Kyrgyz эки (inherited)
→ Ottoman Turkish ایكی (inherited)
→ Old Turkic 𐰚𐰃 (inherited)
→ Yakut икки (inherited)
→ Turkmen iki (derived)
→ Turkmen ikki (derived)
→ Turkish iki (inherited)
→ Turkish ikindi (inherited)
→ Tuvan ийи (inherited)
→ Uzbek ikki (inherited)
→ Bulgar اک (inherited)