actually Arabic does not have the "ch" sound, instead they replace it with "t+sh", so it is written like:
ريتشيل
it script like this (نك)it script like this (نك)
"Nina" is written as "نينا", from English to Arabic
ترستن
تاتيانا
كريستيناthat's how!
ايميلي
Bashirya = بشيرية
Nichola : نقولا
Donna
Yaasameen ياسمين
Like this:رامون
"http://wiki.answers.com/Q/How_is_the_name_john_written_in_arabic_script"