His middle name is James, for his father. It is mentioned in Harry Potter and the Order of the Phoenix during his trial at the Ministry of Magic.
Harry also names his first born son James Sirius after his father & godfather.
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I feel like James' middle name (James as in harry's father) would have been Fleamont, and obvious reference to his own father. And seeing as James set Harry's middle name as his own, it would make the most sense.
His middle name is James, for his father. It is mentioned in Harry Potter and the Order of the Phoenix during his trial at the Ministry of Magic.
Harry also names his first born son James Sirius after his father & godfather.
There are two James Potter's, one is Harry's father and one is his son.
James Potter, Harry's father's, middle name is unknown if he had one.
Harry's son is called James Sirius Potter.
Techumseh
If she has a middle name it is never mentioned in any books written by Rowling.
It is a cat, not an owl: Crookshanks
Harry Style's middle name is Edward.
The Professor's name is Madam Hooch