Learn Italian: Come si scrive il tuo nome? - How do you write your name?

In Italian, it is very common to use the word si to make a sentence impersonal or passive. Si scrive literally translates to "is written" or "writes itself." So, the sentence is really asking "How is your name written?" instead of "How do you write your name?"

Why is there an il before tuo? Doesn't that mean "the your name"?

Yes, it literally means "the your name"! In Italian, possessive words like tuo (your) or mio (my) almost always need a definite article (il, la, i, or le) in front of them. The main exception is for singular family members (like mio padre), but for a normal noun like nome, you must include the il.

Does nome mean first name or full name?

Nome usually refers just to your first name. If someone wants to know your last name, they will ask for your cognome.

Is Come si scrive...? the normal way to ask someone to spell something?

Exactly! Italian doesn't have a direct, commonly used verb that means "to spell." Instead, you ask how a word "is written" by saying Come si scrive...? followed by the word.