Tahpenes (תַּחְפְּנֵיס) was the Egyptian queen whose sister was given in marriage to the Edomite prince Hadad. In 1 Kings 11:19-20, Hadad's son Genubath was raised at the Egyptian court under Tahpenes's care.
Tahpenes 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 Tahpenes reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.