Who are Daenerys Targaryen's dragons named after?
Drogon is named for her late husband, Khal Drogo, and Viserion and Rhaegal are named for her late brothers, Viserys and Rhaegar.
Instruction: Who are Daenerys Targaryen's dragons named after?
Context: 
Response: Drogon is named for her late husband, Khal Drogo, and Viserion and Rhaegal are named for her late brothers, Viserys and Rhaegar.