Io, pronounced Eye-O, is the most perfect name. I'm glad not many 'get' it, it's a name that our daughter will soon be known by, and we couldn't be happier. Io is the most volcanically active body in the Solar System, moreso than Venus, forced by Jupiters' gravitational pull to stretch and release allowing the inside of the moon to become molten and re-solidify during every orbit causing a highly volcanic environment.
Though I enjoy the myth of the supposed nymph, Io, a priestess of Hera, who was caught seducing Zeus and who Hera in turn transformed into a Heifer, that's not why we're using it. Io embodies the idea, for me, that even 500 million miles from it's host star, a previously thought-of lifeless dot is actually louder and more intense than anything closer.
In contrast, we're using Seren as a middle, perhaps barrelled name. Io-Seren, or Io Seren. Ying and Yang. Volatility and Serenity.