Kaisu as a Baby Name. Meaning and Origin of Kaisu

What is the meaning of the name Kaisu ?

The baby name Kaisu is a Female name , 2 syllables long and is pronounced KAI-soo (Finnish: /ˈkɑi̯su/, approx. "KAI-soo").

Kaisu is Finnish in Origin.

Kaisu is a Finnish diminutive turned standalone name, derived from Kaisa, the colloquial Finnish form of Katariina (Katherine). The lineage traces back to Greek Aikaterine; while the exact root is debated, it is widely associated with katharos, “pure,” and has also been linked by scholars to the goddess Hekate. In everyday Finnish naming, Kaisu conveys warmth and familiarity while retaining the classical resonance of its source.

As a given name, Kaisu came into formal use in Finland in the early 20th century, reflecting a broader trend of adopting affectionate forms as legal names, and it saw peaks in mid-century records. In contemporary use it feels vintage yet lively. In Finnish name calendars it is often marked near St. Catherine’s Day in late November. Close variants and relatives include Kaisa, Katariina, Kati, Katja, and Kaija; cognates abroad are Katherine, Catherine, Katarina/Katerina, Ekaterina, and Caterina.