Dilhara is from the Sinhalese දිල්හාරා (Dilhārā — dil heart + hārā stealer/charmer — heart-stealer, heart-captivator). Dilhara is one of the Sri Lankan feminine names — central to traditional Sri Lankan Theravada Buddhist + Sinhalese cultural heritage. Sinhalese feminine name.
Dilhara 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 Dilhara reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.