Kyriaki is from the Greek kyriakē (Lord's day, Sunday — feminine adjective from kyrios — Lord). 290 CE); feast day July 7; her cult is particularly strong in Greece, Cyprus, and the Greek diaspora. Kyriaki Filtisi — modern Greek-American figure. Kyriaki Andrioti — Greek Olympic athlete. Princess Kyriaki — Greek Orthodox heritage naming.
Kyriaki 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 Kyriaki reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.