Lake is from the Old English lacu (stream, body of water). (an indie comedy about female voice actors competing in the male-dominated movie-trailer industry) has been widely praised as one of the standout indie debuts of the 2010s. Lake Bell's birth name is Lake Siegel Bell — the surname Bell came from her parents (her father Harvey Siegel is a real estate developer).
Lake 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 Lake reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.