'De' means of/from in Spanish, thus, e.g.
Don Quijote de la Mancha = Don Quixote of/from La Mancha (an area of Spain)
Some other Spanish names for borax acid are ácido bórico and tetraborato de sodio.
Mariachi, La riostorante de (insert your name here)
Lanzarote, Palma de Mallorca, Ibiza, Formentera, Gomera, Hierro, Tenerife, Gran Canaria...
Ponce de Leon and Hernando de Soto.
Flor de NochebuenaFlor de Pascua
"nombres de la familia"
It is "15 de noviembre." (El quince de noviembre) (Month names are not capitalized in Spanish.)
Some mountains in the US with Spanish names include Sierra Nevada in California/Nevada, Sangre de Cristo Range in Colorado, and Sierra Blanca in New Mexico.
Some examples of mountains in the western US with Spanish names include Sierra Nevada, Sangre de Cristo Mountains, and San Juan Mountains.
You can say "el cinco de octubre". Not that month names are not capitalized in Spanish.
Some popular Spanish guitar names include Flamenco, Classical, and Acoustic guitars.
rio Grande, Guadalupe, Brazos are the names of some such