I'm not sure what it says about the English language that common given names also refer to genitalia, money, prostitutes' clients and toilets (e.g. dick, willy,

I'm not sure what it says about the English language that common given names also refer to genitalia, money, prostitutes' clients and toilets (e.g. dick, willy, john and so on). Probably nothing, but still pretty awkward as a foreigner. You'd think these names would fall out of style but apparently everybody tries their best to be mature about it.