If it's a Hebrew name:
It's pronounced ha-tach, with the "a" sound like the "a" in "father" and the "ch" sound like the "ch" in "Bach" or "loch".
If it's a different word:
It's possible it's a made-up word, in which case the pronunciation would depend on the intended meaning.
Please provide more context or information about the word "Hatach" so I can provide a more accurate pronunciation.