A variant of Katherine, from Greek roots traditionally associated with purity.
Katherinne is a double-n elaboration of one of the most enduring names in Western history: Katherine, itself derived from the Greek Aikaterinē. The etymology has been debated for centuries — some scholars connect it to the Greek katharos, meaning "pure" or "unsullied," while others trace it to an earlier pre-Greek root associated with the goddess Hecate. The purity interpretation prevailed in the medieval Christian tradition, making Katherine/Catherine enormously popular among saints and queens alike.
The additional -n- in Katherinne gives the name a visual weight and distinctiveness, marking it as a deliberate personalization of a classical form. The name's historical bearers read like a directory of powerful women: Saint Catherine of Alexandria, the early Christian martyr whose legendary debates with Roman philosophers made her a symbol of learned faith; Catherine of Aragon, first wife of Henry VIII, whose refusal to accept the annulment of her marriage helped trigger the English Reformation; Catherine the Great of Russia, arguably the most powerful woman in eighteenth-century Europe; and Katherine of Aragon's near-contemporary Catherine de' Medici, Queen of France. Across literature, Shakespeare gave us Kate in The Taming of the Shrew, and Henry V ends with the courtship of Princess Katherine of France — the name carrying both strength and tenderness.
The double-n spelling, while unusual in English, has precedents in various European naming traditions and reflects a broader trend in contemporary naming toward distinguishing children from others who share their name's sound. Katherinne retains every bit of the original name's gravitas and historical depth while signaling that its bearer comes to a great tradition on her own terms.