Everything on the map is a derivation of the biblical Hebrew name Yochanan. It just evolved differently in different places

Ivan is the Slavic relative of the Latin name Johannes, corresponding to English John and originates from New Testament Greek Ἰωάννης (Iōánnēs). The Greek name is in turn derived from Hebrew יוֹחָנָן (Yôḥānān), meaning "YHWH (God) is gracious". The name is ultimately derived from the Biblical Hebrew name יוחנן (pronounced [joχanan]), short for יהוחנן (pronounced [jehoχanan]), meaning "God was merciful". Common patronymics derived from the name are Ivanović (Serbian and Croatian), Ivanov (Russian and Bulgarian), and Ivanovich (Russian, used as middle name), corresponding to "Ivan's son".