Who wrote that Iōannēs is a new name? And new in what context?
I refer you to Wikipedia: John (given name)
The name John is a theophoric name originating from the Hebrew name יוֹחָנָן (Yôḥānān), or in its longer form יְהוֹחָנָן (Yəhôḥānān), meaning “YHWH has been gracious”. Several obscure figures in the Old Testament bore this name, and it grew in popularity once borne by the high priest Johanan (fl. 407 BC) and especially by king John Hyrcanus (d. 104 BC). In the second temple period, it was the fifth most popular male name among Jews in Judaea and was borne by several important rabbis, such as Yochanan ben Zakai and Yochanan ben Nuri.
The name John in its Greek form Ἰωάννης (Iōannēs) features prominently in the New Testament, being borne by John the Baptist, John the Apostle, and several others; the Gospel of John, three epistles, and Revelation are each attributed to a “John”. As a result, the name became immensely popular in Christian societies.