is greek ever written in english alphabet?

I was in math class and my teacher was talking about the greek symbols and how we use them in math and i was wondering if greek words are generally ever written using the normal alphabet?

How do you write ‘Nikki’ in Greek?

I have several Greek friends named Nikki, I was wondering how you write Nikki using the Greek alphabet. Thanks.
I just wanted to add, I meant using Greek symbols.