Which saint's feast is the name day for Ioannis?

It is the feast of the Synaxis of St John the Baptist.

Ioannis: Name Day

Orthros keeps the name day for Ioannis on January 7 on the New Calendar and January 20 on the Old Calendar: the feast of the Synaxis of St John the Baptist.

7JanuaryNew Calendar 20JanuaryOld Calendar

Questions

When is the name day for Ioannis?: Orthros keeps the name day for Ioannis on January 7 on the New Calendar and January 20 on the Old Calendar.
Which saint's feast is the name day for Ioannis?: It is the feast of the Synaxis of St John the Baptist.