Rayko is a Bulgarian variant of Radko. This masculine given name shares the same etymological root as Radko, which is derived as a diminutive form of names beginning with the Slavic element radŭ, meaning "happy" or "willing."In Bulgarian onomastics, Rayko (and its close relative Rayno) represent regional phonetic adaptations, with the vowel shift from /a/ to /aɪ/ (or /ja/) being characteristic of certain Bulgarian dialects. The names are largely found in Bulgaria, and their usage reflects the broader South Slavic tradition of creating aspirational names rooted in positive attributes.Rayko is part of a large family of cognate names across Slavonic languages, including Radek and Radim (Czech), Ratko (Serbian), and Radúz (Czech). Feminine counterparts include Radina and Radka. While not exceedingly common in records, Rayko contributes to a distinctive corpus of Bulgarian personal names that preserve ancient Slavic heritage.The name carries connotations of joy and optimism. In a cultural context, parents throughout Bulgaria likely chose such names to wish their children a cheerful disposition and a positive approach to life. A related variant is Rayno, reinforcing the same phonetic pattern.Meaning: happy, willingOrigin: South Slavic, specifically BulgarianType: First name (masculine)Usage: Bulgaria