In Finland, girls named Milja has name day (Nimipäivä) on the 19th of May.
Milja is a given name. Notable people with the name include:
Milja Hellsten (born 1990), Finnish curler Milja Salovaara (born 1972), Finnish costume designer, scenographer and set designer Milja Simonsen (born 1997), Faroese football forward
References http://www.norskenavn.no/navn.php?id=11183 https://www.nimipaivat.fi/milja.html