So pretty, though it might be a bit of a mouthful for a real name. Despite this, it has a cute nickname in the form of Ash, and could work if the person in question has a larger than life personality.
This name sounds hideous. It's merely a bastardization of the beautiful name Ishtar. Not only that, but Ashtoreth was used by the ancient Hebrews to mock the Babylonians. It also sounds demonic.