If anyone is interested - Columbo's first name is Frank !
[close observation of a screen capture of his police badge]
He's also based on the character of Porphyry from
Dostoyevsky's "Crime & Punishment" - There are some classic episodes but some of the best moments are when he empathises with the killer and despite their actions he treats them with the utmost respect and dignity [ e.g. Donald Pleasance, Ruth Gordon, Janet Leigh...] - My mother's favourite moment is where Columbo loses his temper with Leonard Nimoy's murderous heart surgeon and catches him in the final three seconds !