The 11-letter surname of Comperatore, who was murdered shielding his family as 20-year-old would-be assassin Thomas Crooks shot Trump at a Saturday rally in Butler, Pa., is missing the A on the back of the emblematic firefighting gear.

Trump brought the slain supporter’s actual jacket and helmet with him to accept the Republican Party’s nomination, later movingly kissing the headgear.

“His last name wouldn’t fit on the coat, so he had the A removed to make it fit,” Aaron Newborn tweeted in response to one of the many critics accusing the president of making a tasteless mistake.

Actually… that is his real coat. His last name wouldn’t fit on the coat, so he had the A removed to make it fit.Here it is from Sunday. pic.twitter.com/y4UWaAIgVN

The 50-year-old hero’s “devastated” widow, as Trump described her in his speech, told The Post this week she refused to take President Biden’s call after the murder.

“I didn’t talk to Biden,” mother-of-two Helen Comperatore said Monday from her Pennsylvania home. “I didn’t want to talk to him. My husband was a devout Republican, and he would not have wanted me to talk to him.”

Corey Comperatore was the Buffalo Township Volunteer Fire Company’s chief for a couple years around 20 years ago before reducing his role to focus on his family, though he remained an active firefighter.

“He was one of them guys you wanted to go into a fire with, cause you knew you were coming back out,” company president and 15-year veteran Randy Reamer told The Post a day after the rally. “S–t hit the fan, and you were coming back out with him.”

“What a fine man he was,” an emotional Trump said Thursday night before asking the audience to take “a moment of silence in honor of our friend Corey.”