Etymology

There are two hypotheses:

• From Proto-Indo-European *dyúh₃onh₂-, *dyúh₃nh₂- ‎(“having heavenly authority”), from *dyew- ‎(“sky, heaven”) + *-h₃onh₂- ‎(“burden, authority”), rendering Iuvō, *Iūnis, normalized to Iūnō, Iūnōnis. See Ancient Greek Διώνη ‎(Diṓnē, “Dione”);
• From Proto-Indo-European *h₂yúh₃onh₂-, *h₂yúh₃nh₂- ‎(“the young goddess”), from *h₂eyu- ‎(“long time, lifetime”) + *-h₃onh₂- ‎(“burden, authority”) also rendering *Iuvō, *Iūnis, normalized to Iūnō, Iūnōnis. See Latin iuvenis ‎(“young”).

Pronunciation

• (Classical) IPA^(key): /ˈjuː.noː/
• (Ecclesiastical) IPA^(key): /ˈju.no/, [ˈjuː.no]