Aliza is from the Hebrew עֲלִיזָה (ʿAlīzāh — joyous, cheerful, glad) — from Hebrew alaz (to rejoice). Aliza is one of the Hebrew feminine names — central to traditional Jewish heritage. Hebrew feminine name reflecting Jewish heritage.
Aliza does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Aliza reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.