Tahlia is a phonetic variant of Talia — from the Hebrew tal, meaning "dew" — combined with Yah (God), giving "dew of God." It can also derive from the Aramaic talyā, meaning "lamb."
Tahlia is enormously popular in Australia. In the U.S. it remains rare but distinctive. The Australian-Iranian actress Tahlia Sturzaker is a contemporary bearer.
Tahlia 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.
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In Pythagorean numerology the letters of Tahlia reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.