Don't you find the words to name various groups of animals strange? Here are just some examples:
What the heck?!
It's deliberate, there was a fashion for inventing contrived humorous names for groups of animals and people, from the end of the 15th century - see for example Book of St Albans.
It is possibly that there were specific technical terms for such groups in hunting or falconry or other high class sports, and so people wanting to copy high class behavior created similarly obscure terms. Or possibly it was just a silly fad - the 4chan of the the 1400s
These are called collective nouns:
A noun that denotes a group of individuals (e.g., assembly, family, crew).
They don't all sound this weird:
a group of cows is called a herd,
a group of lions is called a pride,
and a group of ants is called a colony.
They aren't just for animals. Weird or not my favorite one is a scourge of vampires.
Asking for the methodology for naming collective nouns is like asking for the methodology for naming nouns. What methodology gave us the word cat? Any particular collective noun may have an etymology one could discover but the methodology really just comes down to useage. Those that didn't catch on didn't get used and so sound weird to us when they're discovered.
Some that sound weird aren't even animals:
a stack of librarians
a groove of DJs
