Takako is from the Japanese 貴子 / 孝子 (Takako — taka noble/precious + ko child — noble child, precious child). Takako is one of the Japanese feminine names — central to traditional Japanese Imperial heritage. subject of pan-Japanese feminine-naming heritage. Japanese feminine name reflecting Japanese political heritage.
Takako 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 Takako reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.