I need to know how to translate the name Marco to Hebrew writing.?

Answer 1

Marco is written as follows:
מרקו

(BTW, The previous answerer gave you the name in Arabic!)

Please note that vowel marks are not usually written in Hebrew, except by children who have just learned to read. Therefore, I provided the translation without the vowel marks.

Answer 2

That's the best I can do with the free demo from the source below:
مرك

Better yet go here

Answer 3

מרקו

Or, with vowel marks:
מַרְקוֹ

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Not only the first guy transliterate your name into Arabic, he forgot a letter and wrote "Mark".