8 Altaic | 8.5.1.2 Proto-Kypchak to Kyrgyz | {u,ɯ}w {i,y}w aw {æ,e}w → uː yː oː øː
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17 Indo-European | 17.5.2 Proto-Celtic to Middle Welsh | uː {oi,ɔː} → yː uː
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17.7.2.2.1 Old Low Franconian to Middle Dutch | uː → yː
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iu → {yː,io} (outcome varies depending upon dialect; the former seems more typical)
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17.7.2.3 Middle High German to Standard German | uə yə iə → uː yː iː
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17.7.3 Common Germanic to Proto-Norse | iu → yː
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17.7.3.1 Proto-Norse to Old Norse | u {o,ɒ} a au juː → y ø æ y yː / _(C)(C)(C)j
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{(j)u,we}ː {o,ɒ}ː aː au → yː øː æː æy
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u {o,ɒ} a au juː → y ø æ æy yː / _(C)(C)(C)i
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{u,we,wi} {o,ɒ} a au juː → y ø æ æy yː / _(C)(C)(C)i
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wa we wi → ɒː øː yː / #P_
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u {o,ɒ} a au juː → y ø æ æy yː / _(C)(C)(C)j
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u {o,ɒ} a au juː → y ø æ æy yː / #(C)(C)_ʀ
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ɪʊ → yː
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17.7.3.1.1 Old Norse to Early Icelandic | u o a ø y e i → uː oː aː øi yː ei iː / _{ɲc,ɲɟ,ŋk,ŋɡ}
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u o a øː eː y i → ʏɪ oi ai øi ei yː iː / _j
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17.8.2 Proto-Indo-European to Attic Greek | u(ː)(j) → y(ː)(j)
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oj → øj → yj (→ yː sometimes)
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17.8.8 Proto-Indo-European to Ionic Greek | u(ː)(j) → y(ː)(j)
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oj → øj → yj (→ yː sometimes)
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42 Uralic | 42.1.1.1.2 Standard Finnish to Modern Standard Finnish | ie yɤ uo → iː yː uː / _A
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42.1.2 Proto-Finnic to Livonian | eː øː oː ɤ(ː) → iːe yːø uːo ɨ(ː)
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46 Vowel Shifts | 46.8 Greek Vowel Shift | u(ː) → y(ː)
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ai ɔi → ɛ yː
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