It is not any more real than 'pattern' of English male names starting with 'J'.
It is, because the writers had patterns in mind, which is why a quick look at the list confirms it. We are free to imagine other possibilities and frequencies pending further data — however, don’t try to retcon this into a “Rorschach test” out of mere desire to make an alien culture seem more varied than it has been portrayed thus far. We don’t have the license to create, only to observe and report.