Chalk landing place
Derived from the Old English place name Chelsea, originally meaning a wharf or landing place for chalk or limestone. This specific spelling is a modern, creative variation of the more traditional Chelsea, which gained popularity as a given name in the late 20th century.
Less common today
Chelsei isn't in the latest US Top 1000. It last peaked at #4,519 in 1992.
US births per 5-year period, 1990βpresent (SSA data).