Mountain range
A creative spelling of Sierra, which is the Spanish word for a mountain range with jagged peaks. It specifically refers to the saw-toothed profile of the mountains. This variant adds an extra 'e' for a unique visual flair while maintaining the same phonetic sound.
Less common today
Siearra isn't in the latest US Top 1000. It last peaked at #5,109 in 2000.
US births per 5-year period, 1990βpresent (SSA data).