I'm not certain what you mean by alphanumerically, or in what sense this relates to Japanese.
alpha numeric in the sense a to z alphabets and 0 to 9 digits and its combinations like penchal123 raju Rajesh 1001
You can write your name on any piece of paper.
Yes, you can write your name in your passport.
write name of founder of mygilgit.com
name
You say "I write my name in the snow".
You will sign it
"Escribe tu nombre" translates to "write your name" in English. It is a command in Spanish prompting someone to write their name.
Yes, you can write your name on a check as the payee to receive the funds.
"Mero naam Julia ho" is a way you can write your name is Nepali
When writing your name with a Ph.D. included, you would typically write it as Your Name, Ph.D.
After writing the title of your story, you can write your name below it, either centered or aligned to the right margin. You can use your full name or just your first name, depending on your preference and the formality of the document.