Nevertheless, a popular but very implausibel guess for its origin an meaning is a relation to the Italian word mio = 'my, mine', but in this case the book's title would not make sense('mine, my mine') 
These two other derivation theories are unrelated to the Nordic fantasy name as well:
|Female ♀||Male ♂|
|#: count of main first name only|
|&: count of both main and additional first names|
| Name counts are approximate as statistics normally is not published
for names given to less than 3 or 5 persons per country.