You missed my point. If I see for example an enemy ship named "Defender M0 - 45" the number "45" gives me the information that he has build over 45 ships of this ship type. And because I dont want to show the enemys my approximate fleet size I'm forced to rename my ships. Therfore the DEV team should change the name label mechanics so that I dont need to change the name of EVERY ship I produced. I hope I made the issue now clear.

another problem here is i can open up diplomacy and see exactly how many ships of each name you have even if you eliminated the -45 in order for a renaming system to be effective you need to be able to hide ships from diplomacy which is a whole other can of trouble

Taken to an extreme though, that renders the diplomacy trading screen nigh useless.  Why should I let someone else know what techs I've researched?  Or how many planets I've colonized?  Or, indeed, how much money I have.  All of that information could be used against me in war (or other) planning.

Sometimes you're just gonna have to bite the bullet and accept that other factions will know basic things about your empire.  But, then again, so to will you for them.

EDIT::: And, of course, if one wants to follow the example of the Hermit Kingdom, one can always refuse to engage in diplomatic trading.  That way, no one could see what you have when they open the trading screen.  Of course, that also means you can't get stuff from other factions.  But that's why you rip it from their cold, dead, hands. 

yeah, sorry misread that dash as referring to M0-M45.