Here are some Dragonborn last names, offering a variety of styles and sounds to suit different character concepts:

Strong & Powerful:

• Stormblade
• Ironhide
• Scaleclaw
• Emberfang
• Stonefist
• Dragonheart
• Skyfire
• Cinderfall
• Rockjaw
• Volcanicore

Ancient & Regal:

• Dragonsong
• Highscale
• Ancientbreath
• Sunstone
• Moonshadow
• Starfall
• Kingscale
• Queensbreath
• Elderblood
• Wyrmtongue

Mysterious & Ominous:

• Shadowscale
• Nightsong
• Whisperwind
• Deathfang
• Obsidianclaw
• Ashbringer
• Doomscale
• Nightshade
• Grimfang
• Shadowclaw

Unique & Evocative:

• Scalesinger
• Emberwing
• Stonewhisper
• Skydancer
• Fireheart
• Frostbreath
• Sunstrider
• Moonwhisper
• Earthshaker
• Stormbringer

Location-Based (Examples):

• Redrock (from a volcanic region)
• Icefall (from a glacial region)
• Riverbend (from a river valley)
• Highpeak (from a mountainous region)
• Sunkenmire (from a swampy region)

Remember to consider your character's personality and backstory when choosing a last name. The best name will enhance their overall identity and feel authentic within the D&D world.