The name Keerstin is of Germanic origin and is derived from the name Cunigundis, which means "kind, brave". It is composed of the elements "cuno", meaning "kind" or "brave", and "gund", meaning "battle". The name has a long history dating back to the Middle Ages in Germany. One of the most famous bearers of this name was Saint Cunigundis, who was the wife of Saint Henry II, Holy Roman Emperor. She was known for her piety and virtue and was eventually canonized as a saint by Pope Eugene III in 1123. Throughout history, the name Keerstin has been passed down through generations and continues to be used today, although it is still quite rare. It is often spelled in various ways such as Cunigundis, Kunigunde, or even Kunigunda. Despite its rarity, Keerstin remains a unique and elegant name with a rich history behind it.
"Over the span of twenty-eight years, from 1990 to 2007, there were a total of eighty-nine babies named Keerstin born annually, with peaks in 1993 and 2002-2003 at nine and seven births respectively."