Here's a bit of info in lieu of an answer:
Patrick McGoohan (Star of "The Prisoner" BBC Tv Series) holds two
distinctions as a guest star. He is the only one to appear on the tv
show more than three times as a murderor and he is the only one to
ever ask Lieutenant Columbo what his first name was (In "By Dawn's
Early Light"). By the way, his first name was never revealed.
http://www.geocities.com/TvPilotGuy/columbo.html
...the first name of Lt. Columbo was never revealed on either series.
His name has erroneously been stated as "Philip" in a number of
sources. This name was actually invented by Fred L. Worth, the writer
of The Complete Unabridged Super Trivia Encyclopedia. He used the name
"Philip" (found on page 107 of his book) as a check word to prove
whether anyone cited his work in their publications. In a lawsuit,
against the makers of the Trivial Pursuit game, Worths lawyers proved
the games creators had used Worths book as a primary source for
their game material because one of their game cards asked "What is Lt.
Columbos first name." Their game card answer was "Philip."
http://www.tvacres.com/char_columbo.htm
Since we never see Mrs. Columbo, the odds against learning his first
name are prohibitive. By now, viewers were demanding to know Columbo's
first name. It was never given, but columnists have mistakenly said
it's Frank and Joseph. Falk had a stock answer. Whenever anybody asked
him Columbo's first name, he would say it's "Lieutenant." About ten
veers after "By Dawn's Early Light" aired, a popular trivia-minded
board came incorrectly gave Columbo's first name as Phillip.
http://www.columbo-site.freeuk.com/dawn2.htm |