Unknown; likely a modern American invention
Lajada is a rare contemporary name with no established etymological history. It likely originated in the United States as a creative combination of phonetic elements, possibly influenced by Spanish-sounding suffixes or the prefix 'La-'. Because it lacks a traditional root, its meaning is defined by the intent of the parents who choose it.
Less common today
Lajada isn't in the latest US Top 1000. It last peaked at #6,082 in 2000.
US births per 5-year period, 1990βpresent (SSA data).