Marc Márquez Alentà is a Spanish Grand Prix motorcycle road racer and one of the most successful motorcycle racers of all time with eight Grand Prix world championships to his name - six of which are in the premier MotoGP class.
Mireia Belmonte García is a Spanish Olympic, world, and European champion swimmer. She is the first female Olympic champion in the history of Spanish swimming and is widely considered to be the greatest Spanish swimmer of all time.
@glacier_bear_82 is right.There are 829 bearers of this name in Spain (source: Instituto Nacional de Estadística).However, in Spanish, this name is more used as a diminutive of Natalia.https://www.conmishijos.com/nombres/natacha/(in Spanish, it mentions Natacha as a diminutive of Natalia)