1. Yes. I know one who's about 7. And according to this stat http://www.nomix.it/nomi-piu-frequenti-nati-in-italia-2007.php
it's actually n. 26 for 2007. So it might be actually be making some kind of comeback.
2. Not sure if it's given to babies. I know a Russian Maria
in her mid-30s and another in her late 20s.
and Sadako, they're used, I'm not sure if for babies, though. Names ending in -ko fell out of use in recent years because the suffix means "child" and it's now considered belittling, so it's probably difficult to encounter a Sadako under 20 or so.
*BtN's resident 10th century Japanese novelist*
My lovely !!! are Mehitabel
"A tuo ammaestramento. Sai tu qual sia, in questa nera valle, la risultanza di ogni sforzo e sacrifizio umano? Calci, nel deretano."
Brancaleone da Norcia