
1) Italian girl name 2) Spanish surname 3) Ward of Madrid 
Found on 
https://www.crosswordclues.com/clue/lucero

Lucero is an Italian name for girls. The meaning is `light` The name Lucero is most commonly given to American girls. Lucero is given to boys and girls in the Netherlands Use for the other sex: Lucero What do they use in other countries? Luca (Hungarian) Luka (Russian, Slavic) Lucca Lux (English) Luz (Spanish) Lucy (English) Luce (French)
Found on 
https://www.pregnology.com/names/girls/Lucero
  No exact match found.