ESA committed to launching 5 ATV vehicles. All 5 were named.
JAXA has committed to a limited number of HTV launches. And all have been named.
Orbital has contracted for 8 launches, and seems to be naming the Cygnus modules.
Russia has been launching Progress and Soyuz vehicles by the hundreds for close 40-50 years, and has not named any of them beyond a mission number/identifier.
SpaceX has launched several Dragons, with 10 more to go under the current contract and none have been given names.
Can one infer a philosophical difference in the goals, based on the naming pattern? It seems like SpaceX has a more open ended plan like the Russians as compared to the ones with more limited scopes.