Your name in japanese …
… bei Robert bin ich auf eine witzige Seite gestossen, wo man den eigenen Namen ins Japanische übersetzen lassen kann. 
It is pronounced "RAINAA". (Consonants are pronounced more or less the same way as in English. "A" sounds like a in father, but shorter. "I" sounds like ee in meet, but shorter. Double vowels like "AA" are held for twice the duration of single vowels.)
In Nippon heiß ich “tomasu”… hehe, sehr cool