also @dora_da_destroyer Jon's real name is significant because it is the name if the first Targ king of Westeros.
He was the 1st king of Westeros, period, not just the 1st Targaryan.
He settled Dragon Stone and was the King that landed at King's Landing.
There were like 6 or 7 other Aegon Targaryans between the 1st and Jon, just like the Starks have a lot of Brandons.