there is a semitic deity, ishtar/astarte, that seems to have some relationship with the indo-european goddess of the dawn through a linguistic borrowing but not through direct comparative mythology. there are some claims that easter is a corruption of astarte. i'm not willing to discard the idea, a priori, as many are. the idea is less absurd on it's face than many may claim, as we know that there were all kinds of mystery cults in the roman empire. while easter does not seem to derive from astarte, jesus does seem to derive from isis.

it actually seems to be the other way around. the semitic sumerian name for the goddess ishtar actually seems to be inanna, which is an etymology that is very different and actually comes from a semitic sumerian word/root. astarte/ishtar appears to be an indo-european word borrowed by the semites to describe a semitic sumerian, rather than indo-european, deity. it might have origins during one of the early indo-european occupations of mesopotamia, and there were several before cyrus, some quite ancient.

so, easter is not derived from ishtar, but ishtar appears to be derived from the same word as easter.