If everyone had only a single name, it would get awfully confusing.
Are you shmendrick saying that 600 male names in Tenach is not sufficient choice of names to avoid confusion?
B’H I have 1 Hebrew name, and B’H my Dad has 1 Hebrew name, so it is so much easier when I receive an Aliya, to simply give the Gabbai 1 name for myself & 1 name for my Dad.
If someone does have a double or more names, I had a Pesack from Rav Melech Shachter ZT’L, that one ought to utilize all that person’s names, each time once calls or refers to or addresses that person. But he also said in no uncertain terms, how absolutely preferable it is to give a single name only.
My having 1 Hebrew name & my Dad having 1 Hebrew name, I have several times been called upon to be an “Eid” to sign Kesuvoh & Get, because the Mesader Kiddushin & Mesader Get did not wish to get involved with complex multi-names.