Taking on a Hebrew name?

[Mattityahu ben Noach]

On another forum I chose a name that I thought sounded Jewish/Hebrew. The name I chose was Pi-thu-el. I chose it because of a play on words. A supervisor I once had once told me I had a "proclivity to laxity," so I chose "p-to-l" as my name in this other forum, but I spelled it "Pi-Thu-El" (pronounced as "pee-tu-el"). Later, I was informed that "Pethuel" is a name found in the book of Joel. I have read the entire Tanakh, so I must have read that name before, but I didn't recall the name being there, and when I went to look up "Pithuel" I didn't find anything. (Note the 'i' instead of the 'e').
Is the fact that a name I chose for myself actually exists and is in the Bible coincidental?
I understand the name "Pethuel" means something like, "openminded to G-d". Can you confirm that, or tell me anything about the name or about the person in the Book of Joel that had that name?
Thanks.