Island of chalk; or a variant of Chelsea
Chalsey is most commonly used as a modern phonetic variant of Chelsea, which refers to a landing place for chalk or limestone. It may also be interpreted as a combination of names like Charles and Halsey. As a rare spelling, it offers a unique twist on a familiar 1990s favorite.
Less common today
Chalsey isn't in the latest US Top 1000. It last peaked at #7,775 in 1990.
US births per 5-year period, 1990βpresent (SSA data).