Depends on what kind of dragon.
For a frost/water dragon:
Sapphire
Tide
Ice
The name of any ocean/sea
Megophias(after the last officially sighted water dragon in 1860...supposedly)
Nessie/Shirley/any other 'Loch Ness Monster'-type creature's name(Some believe that these are really water dragons)
For a Golden Dragon:
King/Queen
Raider
Raja
Ray/Re
For a classic European dragon:
Soreth
Quenth
Rasenth
the name is dragon or monstruo
The Pink Dragon's name from Dragon Tales is Cassie!!! She is Fun Loving and Adorable
A dragon
You can name a dragon on dragon cave before or after you find out what gender it is; it doesn't really matter when.
The name of Dragon Door's magazine is "The Dragon Door Journal."
Draco, 'dragon'.
Draco
Toothless
water dragon or ice dragon
The dragon has no personal name, it's simply "Y Ddraig Goch" ("The Red Dragon").
GED doesn't kill the dragon he makes a "bet" with the dragon, by the dragon's real name. Ged tells the dragon that he will not tell the dragon's real name if her doesn't go to the archipelgo.
The topaz dragons name is Fidelis. The ruby dragons name is Joyeu. The lapis lazuli dragons name is Fortuna. The emerald dragons name is Honora. The amythest dragons name is Veritas. The diamond dragons name is Forta. The opal dragons name is Hopian.