Peace 786,
1} Many Islamic scholars say that Mary(r) had a brother named after Prophet Aaron(a) which could have been possible as many of us (like the Prophet(s) says) give names to our children after the names of Apostles and pious persons.
Those Islamic scholars are very wrong.
Mary never had a brother named Aaron.
2} Abdullah Yusif Ali says in his commentary ~"Mary(r) is reminded of Her high lineage"~ meaning that She was a blood descendant of Prophet Aaron(a) and Moses(a)and She was given a title of honour after a name of an Apostle of which lineage She came from.
Mary was not a direct descendant of Aaron.
~"And Miriam the prophetess, the sister of Aaron, took a timbrel in her hand; and all the women went out after her with timbrels and with dances."~
{Exodus 15:20}
*} In the Bible we have the sister of Aaron(a) called Miriam(r) who has a father called Amram(r)
This prophetess
is the same Miriam that's Moses's and Aaron's sister.
This is no anachronism.