cualquiera
anyone
cual
which
+
quiera
wants (subjunctive of querer)
Cualquiera means anyone and is composed of cual0 (which0) and quiera1 (wants1). It literally means 'which(ever) one wants', implying any person.
pronoun
- anyoneAny person or thingCualquiera puede participar en el concurso. // Anyone can participate in the contest.