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If you mean how to write 'Joseph' in Japanese : ジョセッフ (jo se'ffu) is the answer.
Z. single roman letters can not be written in Japanese
As in you write a letter to someone? Tegami.
Bobby in Japanese is phonetic: ボッビ (bobbi).
ジュベララ /ju be ra ra/.
Happiness is 幸せ and happy is 嬉しい
When writing a letter to Japanese person you need to establish what language to use. You should ensure you know the type of letter whether it is informal or formal. Have your content in place and write it just like any other letter.
モスクエダ this is how you write mosqueda in Japanese
Japanese
The letter "D" does not exist in Japanese. Instead the "d" sound is incorporated into some Japanese syllables: da, de, and do.