Where did the name "Lawliet" come from?

this is L's last name. other than this information, there is nothing else specified

Huh...i never knew about that name...And how is it a last name?

At first I thought this was a vraag about how the writer came up with that name. That would be interesting to know. But apparently it is not.
Lawliet is L's last name. u learn this in "L Change the World".

i think its french of british some european name

I heard it's a British name... though I live in the UK and ain't ever heard the name before. Maybe it's old-fashioned? I'll be hyped when I find someone with the name though.
Prove it's his name; It's in "L Changes the World" movie. Don't know about the novel as I yet to read it.
It's also in Death Note 13: How to Read. It's in his bio saying it's his true name. The book also comes with a True Name card. (Which looks awesome, btw.) Which also has the name "L Lawliet" on it.
I believe it's pronounced Law-Leet. Though I could be wrong. But that's how I say it as that makes the most sense to me.