I use these criteria for naming my rockets. 1) Pick a mythological creature or a videogame character. 2) Ships with similar purposes have related names. (All my manned orbiters have had names taken from Skyrim's Dragons. Paarthurnax, Odahviing and Alduin) All my munar rockets are named after things related to werewolves (Garou, Talbot, Philodox). For probes missions I use Lovecraftian names such as Byakhee or Shub-Niggurath. 3) If I do minor improvements to a ship (Probably due to a technology) or build a new ship based on an older design, I add a descriptor or "mark". (Shub-Niggurath Heavy, Paarthurnax Mk 2) 4) My space stations (So far I have only one called Sylphide) take its names after female greek mythological beings. 5) For my first manned Duna mission, I used a transfer ship and a lander which was specifically designed for landing in Duna. I called the transfer ship Polyphemus and the lander Galatea.