Mountain range or saw-toothed
Seairra is a modern phonetic spelling variant of the Spanish name Sierra. It refers to a rugged mountain range with a jagged profile, specifically the Sierra Nevada mountains in California and Spain.
Less common today
Seairra isn't in the latest US Top 1000. It last peaked at #5,367 in 1999.
US births per 5-year period, 1990βpresent (SSA data).