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Those are all versions of the same deity. There were multiple lines of descent from Inanna, though some think that Ishtar was original and was introduced to the Sumerians by the Akkadians, where she became Inanna. But it goes like this:
Inanna > Ishtar > Astarte > Aphrodite > Isis
From Mesopotamia to the Levant to the Mediterranean and Egypt.
Another line of descent is:
Inanna > Neith > Tanit > Anat > Athena > Mary
From Mesopotamia to Egypt and the Levant, then to Greece and back to the Levant.
Hundreds of forms of this goddess, however. The most common symbols for her are the Pentagram, Octogram, and Dove. Common titles focus on Heavenliness (Queen of Heaven or Urania), virginity (or simply being a nubile girl), and battle.