Thandiwe is a Zulu and Xhosa (South African) name meaning "beloved" or "loved one." From the root thanda (love).
Thandiwe Newton (born 1972), the British actress, has gone by Thandie for most of her career but now uses Thandiwe — the name's correct pronunciation and spelling.
Thandiwe 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 Thandiwe reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.