The kicker is the explanation for the name. Signal and Orphan feel like bad place-holders, but at least they have mundane and not lame explanations. Drake could have a cooler explanation… but instead it’s just the duck.
Seriously, the Spanish Empire figured out that calling Francis Drake “El Pato” would have been lamely useless in warning people about him; and if they figured out that calling Drake “El Draque” because dragons just communicate a much clearer level of threat was the right move way back then, then no one from Gotham would take “The Male Duck!” seriously.