Oh, now I feel dreadfully boring.
Mine? Because that's why my parents named me?
But if you wish for an etymological explanation...
Daniel is old Hebrew, made from the elements Dan-i-el. Dan is the Hebrew for 'Judge', and 'el' is an old name for God, originally the name of the Canaanite bull-god, and later adapted by the Hebrews. As such, the name means, technically, 'God is my judge', although one could also say 'God has vindicated me', as Leah does when her son Dan is born.
As for Krispin, this is a German version of the name Crispin, which comes up now and again in English. Far as I know, this probably is an adaption from a saint name (ie. Saint Crispin, patron saint of shoemakers, and upon whose day the battle of Agincourt was fought.) Crispin itself is from the Latin Crispinus, which means 'curly' (implying 'curly haired' I suppose.) I suppose my distant ancestors were peasants without a last name and, in taking one, merely appropriated one from a saint.
However, there are other names I'm wont to use on forums, and in particular on the IRC. For example, Alexaion, and that might have a more interesting etymology. That one is a Greek name that I pieced together (I've never seen it actually appear in ancient Greek texts.) Long, long ago when I first started posting on forums, my screen name was 'Guardian of Ages.' When I outgrew such a silly name, I nonetheless decided to retain it, save in a different language (I think I first used it, actually, in a mock story I wrote about another forum, which I set in ancient Athens and gave all my fellow forum posters names after the Greek.) Anyway, Alexaion is as close as I can get to Guardian of Ages. Alex, used as a prefix, means 'defender' (ie. Alexander = defender of men) ; Aion is the Greek word for an age, sometimes spelled in English as 'aeon'. Hence, Defender of the/a Age.
I've not gone by many other names. I think I might have at one time gone by Herald of Mandos on a forum here or there... Mandos being the keeper of the dead in Tolkien's world, and his herald (or he himself) the one that pronounces the judgement upon the Elf-lord Feanor and the other Noldorin exiles from Valinor.