Krešimira is the feminine form of the Croatian name Krešimir, a royal name borne by four kings of Croatia in the 10th and 11th centuries. Its masculine counterpart was Latinized as Cresimirus, and a diminutive form is Krešo.
The name Krešimir is composed of two Slavic elements: krěsiti meaning "to spark, to flare up, to bring to life, to resurrect" and mirŭ meaning "peace, world". Thus the name carries a sense of "one who resurrects peace" or "reviver of the world", a powerful and evocative meaning for a medieval ruler.
As a rare feminine derivative, Krešimira is used primarily in Croatia, though it is not common today. It reflects the tradition of adapting masculine Slavic compound names into feminine forms, a pattern also seen with names like Višeslava from Višeslav or Branimira from Branimir.
The historical significance of the root name Krešimir is considerable: King Petar Krešimir IV (reigned 1058–1074/75) was one of the most powerful rulers of Croatia, and his name appears in many medieval documents. The female form likely arose as a learned revival in modern times, occasionally given to honor the royal lineage.