"Un día de mayo"

[seanhurson]

Was a second away from typing "a day of mayonnaise". Think I need sleep.

[Lil_Tunechi]

It sounded like un dia de majo to me

[AV01]

incorrect pronunciation of mayo

[Iago]

majo would sound like maho, if you catch my drift. And maho would sound like mao.

A more cosmopolitan way of pronouncing it would be somewhere between English y and English j, but some places like Spain it is substantially harder on the "y" sound and in others like Colombia it is strongly on the "j" sound. In general it's somewhere in between. This goes for y and for ll.