When speaking of an archetypical kind of person, should plurals use "s" or " 's "?
Courtesy of Lynn Miclea, Author
The reason it sounds odd is that your mind recognizes 'Eduardo' as a proper name, which it knows ought to be singular. If we switch to a class name that ends in a vowel — e.g. 'dingo' or 'alpaca' — the plural seems perfectly normal ('dingos', 'alpacas'). It is a little smoother with names that end in consonants, like 'Kens', 'Alberts', 'Sarahs'... You might be a little more comfortable using the 'potato' strategy: i.e., use 'Eduardoes' (adding an 'es', not an 's').