I have an odd question that will probably never be answered now unless they decide to bring this species to other Trek shows: why are members of Merp’s species called “Big Merp”, “Sleepy Merp”, or just “Merp”?

Obviously out of universe, they’re likely just a parody of the Smurfs.

My personal favorite theory that would be that Merpkind (or whatever they are called) doesn’t actually have a native concept of individual names. However, they’ve got to put something on the Federation paperwork, so they typically just do whatever and stick with it.

Alternatively, fitting more with the Smurf thing, Merp communities identify each other via adjectives or roles much like the Smurfs.

What’s your ten cents?

EDIT: Thinking on it, it could be a combination. No one has a set name - some might call their spouse “Mate Merp”, while that spouse might be referred to by a boss as “Strong Employee Merp.” When doing Federation paperwork, Merps typically choose which descriptor they’re more fond of. For instance, Sleepy Merp may have been referred to as that by a parent.