Modern English variant of Milo, itself from Latin or Germanic roots meaning 'soldier' or 'merciful'; the Y spelling is a contemporary stylistic choice.
Vibe
playful
How it ages.
Trendy right now; the variant spelling may date it to the 2010s-2020s more than Milo would.
The cultural moment.
Rising in the UK and Australia since 2015 as part of the broader Milo trend.