Variant of Katherine, from Greek 'katharos' meaning pure.
Katherina is among the oldest and most historically resonant variants of the name that spreads across Western civilization as Catherine, Katherine, Katarina, Ekaterina, and dozens of other forms. The Greek root Aikaterine is ancient, its precise origin debated: one tradition links it to the Greek katharos, meaning pure, an etymology encouraged by early Christian scholars who associated it with the virtue of Saint Catherine of Alexandria, the fourth-century martyr whose legendary erudition and philosophical combat with pagan scholars made her the patron of scholars, libraries, and wheelwrights. The Catherine wheel, both a firework and an emblem of her torture, has immortalized her name in imagery.
Katherina with the distinctive -ina ending carries a particular Continental and dramatic charge. Shakespeare chose this spelling for the fiery heroine of The Taming of the Shrew — a choice that has meant the name has carried, for four centuries, an association with wit, defiance, and a refusal to be easily managed. Katharina of Aragon, first queen of Henry VIII, bore the variant with magnificent tragic dignity.
Empress Catherine the Great of Russia — born Sophie of Anhalt-Zerbst — ruled under the Russified form Yekaterina, making the name synonymous with enlightened absolutism and imperial ambition. In the present era, Katherina offers something the shorter Katherine cannot quite match: a fullness of form that feels ceremonial and Old World. It is the name written on a birth certificate that shortens to Kate or Kat in daily life, but which preserves, in its formal spelling, a link to the philosophers, saints, and queens who carried it across two millennia.