Here are some name suggestions based on "dressyshäst," "hingst," and "långt tävlingsnamn" (dressage horse, stallion, long competition name):

Combining Elegance and Strength:

• Aethelred the Valiant
• Oberon's Majestic Grace
• Lord Valerius the Bold
• Caspian's Midnight Reign
• Imperator's Silver Dawn
• Regal Stormwind
• Black Knight's Triumph
• Sir Lancelot's Legacy
• King Arthur's Command
• Windsor's Noble Heart

Emphasizing Lineage and Heritage:

• Von Falkenberg's Paragon
• De Montaigne's Éclair
• Du Lac's Royal Decree
• De Valois's Phantom
• Von Hess's Starfire
• Chateau de Loire's Majesty
• Highland's Sovereign
• St. James's Glory
• Windsor's Legacy
• Royal Crest's Champion

Focusing on Physical Attributes (if known):

(These require additional information about the horse's coat color, markings, etc.)

• Example: If the horse is black: Midnight's Obsidian Star, Coal's Ebony Majesty
• Example: If the horse is grey: Silverstream's Comet, Moonstone's Whisper

Modern & Stylish Names:

• Zenith's Eclipse
• Quantum Leap
• Astral Knight
• Phantom's Dance
• Shadowfax's Legacy
• Ironclad's Grace
• Velocity's Reign
• Apex Predator
• Crimson Fury
• Midnight Bloom

Remember to choose a name that is easy to pronounce, remember, and reflects the horse's personality and potential. Consider the flow and sound of the name when spoken aloud.