Mario de Monti wrote:
But seriously, Starfleet (admiralty, ship personnel, Starfleet Academy) is mostly staffed by humans, with "aliens" being a clear minority. So it is only logical that in-universe Starfleet would name its vessels accordingly, chosing mostly earth-related names. Apparently humans are the main "operator" of Starfleet and possibly also driving force behind it.
Or many of the background characters we've seen are actually human-looking aliens (there are a lot of them out there).
Despite what we've seen on screen, I think that humans are actually a minority in Starfleet, after all there are 150 member worlds, plus many non-Federation citizens who choose to enrol (eg Worf and Nog), and not every human will want to go into Starfleet. On screen we've only seen a very small portion of a single ships crew complement, let alone the fleet as a whole.
That's how I choose to look upon things anyway.
Commander Austin Harris, First Officer, Deep Space Nine (by FltCpt. Bossco)
8.01 - Darkest Before Dawn
(Chapter 8 added, 12/09/2015)