My name is Nobody...
Nemo is also a very popular character in Jules Vernes (20000 lieux sous les mers). I don't know why he was named so, but there's a reason. For the little fish, it's probably the association of ideas Captain Nemo -> water -> fish.
Unless there's another hidden reason in addition.
I believe Nemo in Jules Verne's novel is a man exiled from his native country, who thus has no identity - no nationality to identify himself with - and therefore takes on the name "Nemo". I think one explanation was that Jules Verne, being a Frenchman, imagined Nemo as an Indian, fighting the Brittish ships as an opposition to the Brittish occupation of his country. But this wasn't explicitly stated in the novel of course.
According to Hans Ørberg's sidenote on chap. X of LLPSI, 'némó' < ne + homó = núllus homó, which translates directly to 'no man', therefore I think my answer—'no man asks the goddesses'—should be accepted.