It can be written: ジャン
ジャン /jan/ if you mean it as a name. If you mean 'January' it is 一月 /i chi ga tsu/. The word 'January' itself can be referred to in Japanese as ジャニュアリー /ja nyu a ri/.
Japanese artist and print maker is called Katsushika Hokusai.
cat paw print
"Jan" is the polish name for "John".
That term in Japanese would be 剃刀忍者 /ka mi so ri nin ja/. There, you can print it.
Jan Skene's birth name is Jan Anderes.
Jan Seybold's birth name is Jan Niebuhr.
Jan Zdrojewski's birth name is Jan Soldenhoff.
Jan Vrijman's birth name is Jan Hulsebos.
Jan Ainley's birth name is Jan Porter.
Jan Bielicz's birth name is Jan Toltyzewski.
Jan Broberg's birth name is Jan Broberg.