Figure 4: Testing for gluteus maximus weakness. Clinical testing of the GM can be done by having the patient perform a one-leg squat or hop or by watching the patient descend stairs. The knee should track down straight in alignment with the tibia and femur (left image).
Surnames relating to color are relatively common in Spanish, and in Catalan too. Examples: Blanco in Spanish and Blanc in Catalan, meaning White in English, Rojo in Spanish and Roig or Vermell in Catalan, meaning Red, Negro in Spanish and Negre in Catalan, meaning Black.
If you mean royal in the phrase that it used to be the color of rayalty and kings: Red, Bright blue and purple (and ofcourse gold). This is because those colors were hard to get and thus expensive, so paints and clothes in these colors could only be afforded by rich people, thus making them royal.