The earliest records of the personal name Velychko come from Latin-language artifacts from the southern slopes of the Carpathians. For instance, in 1437, it was noted: Lucas filius Welyczko and Cosmas similiter Welyczko in the village of Koromlya near the city of Uzhhorod. Throughout the 16th and 17th centuries, this name frequently appeared in Maramures. For example, in 1519: serf Jo. Weleczko in the village of Lypcha; in 1549: nobleman Ge. Waynaghy alias Wylyczko in the village of Vonyhovo; in 1553: serf Weliczko Nyavalya in the village of Horinchovo; in 1578: serf Velychko Kurta; in 1605: serf Velicsko Lazor in Ruske Pole; and in 1715: Zsotun Velicska in the village of Bedevlya.In 1563, the name Velychko was recorded in Podillia: Ivan Velychko in the town of Kremenets. In the Dnipro region, the name Velychko was mentioned several times in the registers of the Zaporizhzhian army in 1649, including Cossack Velychko Bosovsky from the Bratslav regiment, Velychko Horodetsky, and Velychko Bunayevsky. Patronyms such as Veliczat, Velychkanich, and Velychkovsky are derived from the name Velychko, as well as surnames like Samiylo Velychko.Notable Cossacks from the Uman regiment in 1649 include Roman Velychchenya, Hrytsko Velychchenko, and Ivan Velychchenko, as well as Cossacks from the Bilozerkiv regiment Tymosh Velychchenko and Vasko Velychchenko, and Cossack Semen Velychko from the Korsun regiment.The name Velychko is also known outside Ukraine. For example, in the Belarusian city of Mozyr, in 1552, a peasant named Velychko Kondratovich is noted. From the 14th century to the present, the name Velychko has been recorded in Serbia and Bulgaria. According to researchers, in the Bulgarian context, the name Velychko was a wishful name expressing the idea “May [he or she] grow up to be great!” Therefore, the name Velychko is an ancient Slavic intrafamilial name formed from the adjective “great” using the suffix -ko or directly from the diminutive form of the adjective “velychky.”