It looks like a 'combination' of
Mila, which is quite high on the charts and
Elena, which seems to be one of the most liked names, imo.
So, I've thought
Milena is more popular around the world!
But, while
Mila -
20th (USA)* /
50th (UK)**
and
Elena -
55th (USA) /
134th (UK)
Milena dropped from
679th in 2019 to
821st in 2020 in the USA / and is just
480th in the UK
*2020 for the USA
** 2019 for the UK