I need to figure out which Greek island the last name Kurtis comes from.?

Which greek island's ancient name could be americanized to give us this last name?

That could be Corfu.
Corfu (Greek: ¦ª?¦Ñ¦Ê¦Ô¦Ñ¦Á, K¨¦rkyra; Ancient Greek: ¦ª?¦Ñ¦Ê¦Ô¦Ñ¦Á or ¦ª?¦Ñ¦Ê¦Ô¦Ñ¦Á; Latin: Corcyra; Italian: Corf¨´) is a Greek island in the Ionian Sea.

You can read more about it at wikipedia:
http://en.wikipedia.org/wiki/Corfu

Or, it could be Crete which is Kriti in Greek. It is located in the Mediterranean Sea.

Yes i named
my first daughter after
its Cor-rin-thi-an,
No =one can
top [10 *] their
Yathmen *
ARISTO,*
thy myth if but
just a story *
ha,,what a saint *
[thy bulls in the ring *
RUN ME OVER *
i refuse to WALK *
sure became history *
we live it every=day *
back=wards *
[AC,,DC,,] O.K.
DOCK ME *
but make sure its by the sea *
i love naked MEN *

my son IN-LAW *
BALD AS AN EAGLE *

it can either be in the sarconic or ionian islands