I would agree. I read he will be Jewish as well mainly from Daniel 11:.....
37Neither shall he regard the God of his fathers, nor the desire of women, nor regard any god: for he shall magnify himself above all.
38But in his estate shall he honour the God of forces: and a god whom his fathers knew not shall he honour with gold, and silver, and with precious stones, and pleasant things.
In the Old Testament God of your fathers is used in reference to Abraham, Isaac, and Jacob. As well as other places it reads to me that it can also be their forefathers in general. So would lean towards this verse in Daniel pointing out that the individual would be Jewish. Not sure on Dan have read different theories and don't really agree or disagree have just not read anything yet that would tip me heavier to one side of the argument for or against.
Reckon my hesitation would be the anti-christ is also called the Assyrian. So could be he may be of Dan and his linage is of one of those that were relocated to Assyria. You can research Assyrians and find that they are a minority group in Iraq as well as amongst the Kurds. There are actual ethnic Jews that are still amongst the Assyrians and are called of Assyrian Jews. As well as Assyrians that have become Jews by religion rather than ethnicity.
What I have oft found interesting is that Jonah bought the Assyrian's some time by their repenting. However, was not to long after Jonah that God ended the nation of Assyria. Of course some of those of the nation of Israel were relocated into Assyria. When Assyria ended Israel.
So have oft wondered if some of those that repented offered safe harbor to the Israelites that were relocated to Assyria. Could this be done in advance so that the anti-christ could fulfill scripture so that he would be Jewish but also grew up amongst the Assyrians so that he could be called the Assyrian.
One thing is for sure Assyria is unique amongst the ancient empires that God sent a prophet to them to repent prior to Hebrews being relocated there.