"X" comes from the Greek letter Chi, which is the first letter of the Greek word Χριστός, translated as "Christ".
The term "Christ" has no etymological origin in Hebrew. (The Hebrew term for Messiah is Moshiach.)
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There is no Hebrew meaning for the letter "x" or any other letters of the Latin alphabet.
There is no Y in the Hebrew alphabet. There is a letter that has the same sound as Y (called Yod) but it looks completely different.