Well so far in 1.0 we have gone through 3 sets of server names from Beta to now:
FFXIV 1.0 Closed Beta - Theme = Nemesis
Garland (FF1), Emperor (FF2), Golbez (FF4), Exdeath (FF5), Kefka (FF6), Sephiroth (FF7), Ultimecia (FF8), Jecht (FF10), Shadowlord (FF11), Gabranth (FF12)
FFXIV 1.0 Open Beta to World Merge - Theme = Cities
Original (01-09-2010) - Cornelia (FF1), Kashuan (FF2), Gysahl (FF3), Mysidia (FF4), Istory (FF5), Figaro (FF6), Wutai (FF7), Trabia (FF8), Lindblum (FF9), Besaid (FF10)
Added Later in Beta (03-09-2010) - Selbina (FF11), Rabanastre (FF12), Bodhum (FF13), Melmond (FF1), Palamecia (FF2)
Added at Release (21-09-2010) - Saronia (FF3), Fabul (FF4)
Added a few weeks in (02-10-2010) - Karnak (FF5)
FFXIV 1.0 World Merge - Theme = Weapons
Ridill, Masamune, Durandal, Aegis, Gungnir, Sargatanas, Balmung, Hyperion, Excalibur, Ragnarok
2.0 Server names will probably be either ba (a) the same as 1.0 post merge (plus a few), (b) the new theme currently used in closed beta or (c) a second new theme for open beta, carried to release. Either way it won't really make much of a difference IMO, except for making the devs work a bit to figure out new server naming themes.
Side Note: Went through a bunch of old Lodestone posts to get the server information. Makes me feel quite old when I see all the patch notes and "Ask the Devs" (they were fun) blurb about features, from way back in 2010 XS