Q. -ion suf. “-son, masculine patronymic” (Category: Son)
The usual patronymic for “son of” in Quenya, suffixal form of Q. yondo “son” (PE17/170, 190). Tolkien occasionally mentioned variants like -on or -yon, but in practice only -ion appears in actual names.
Conceptual Development: This patronymic dates all the way back to Qenya Lexicon of the 1910s (QL/106) and was regularly mentioned in documents throughout the years such as the Early Qenya Grammar and English-Qenya Dictionary of the 1920s (PE14/45, 75; PE15/77), The Etymologies of the 1930s (Ety/YŌ) and Notes on Names (NN) from 1957 (PE17/170), always with a similar form, meaning and derivation from roots likes √YO(N). Thus it was very well established in Tolkien’s mind.
References ✧ PE17/170, 190
|✶-(i)ŏn/-(ĭ)ondo > -ion||[-ion]||✧ PE17/170|
Reference ✧ Ety/YŌ ✧ “son”
|ᴹ√YON > -ion||[-ion]||✧ Ety/YŌ|
References ✧ LT1A/Urwen; LT2/89; LT2A/go, Indorion; PE14/45, 75; PE15/77; QL/96, 103, 106
|†yó||“son”||✧ LT2A/Indorion (†yô); QL/106 (†Y̯ó)|
|yondo||“son, male descendant, (great) grandson”||✧ PE14/45|