Calle de Castrejón
Takes its name from Castrejón, a Castilian place name for several villages, from the Latin castrum in diminutive form, for a small fortified enclosure.
Castrejón is a village name repeated across the Castilian plateau. The word comes from the Latin castrum, the fortified enclosure, in its diminutive form: a Castrejón was a small hillfort, a handful of walls up high where one could take shelter. Which of those Castrejóns Madrid meant to recall in naming this road was never documented.
The street belongs to the villa estates raised at the start of the 20th century between Prosperidad and Chamartín de la Rosa, when the countryside still reached this far and Madrid was trying out the English garden-city idea. Today it is a short pedestrian stretch of the Chamartín district.