I like most of these names; just not sure if they're paired well IMO.
Madden Joseph is nice and masculine/strong, but I think Madden Alexander would flow much better
Carson James is very nice; I'd personally spell it Karson
Noah Anthony is just okay to me. Love the name Noah but not sure Anthony goes well with it... Noah Joseph sounds better to me
Landon Anthony sounds really nice actually, and although I'm not a big fan of either name, they pair well.
Nicholas Austin sounds nice but seems difficult to say aloud (maybe it's just me?) Nicholas Alexander or Nicholas Joseph sound better
Julian Alexander is a nice strong name! Really like how they are paired, although really dislike Julian personally.
Austin Julian just doesn't seem to flow well at all IMO. Austin is a nice name and can be paired with Austin Alexander, Austin James, etc and sound strong and will age well. Again, not a fan of Julian but Julian James or Julian Nicholas could work?
Favorite: Austin Alexander or Madden Joseph
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Least Favorie: Julian; Austin Julian