The word Ithaca in Classical Greek

Greek Homeric Greek and Early Greek Poetry
1

I’m simply looking how to write the word ‘Ithaca’ in Classical Greek for the purposes of a tattoo.

Any assistance most appreciated.

2

ΙΘΑΚΗ, Ιθακη, or Ἰθάκη.
But if it’s not nominative (e.g. subject of sentence) it will have another letter at the end, and you shd ask again.