[sarasi]

MurakamiKitsune, there are potentially hundreds of ways to write many kanji names, and only the person with that name/their friends and relatives etc. will know what characters are used to write that person's name.

Miyako in particular can be written in many different ways, including with just one kanji- 都 , so you have no way of knowing if the version you have given is correct or not.

As for rose, did you check an online Japanese dictionary? Rose is bara, which is often written in hiragana- ばら, or katakana- バラ, but occasionally in kanji- 薔薇. You can see how complicated the kanji are- most Japanese people can't write it without checking, so they write it in hiragana or katakana.