Filius Flitwick. The Sorting Hat considered Sorting Filius Flitwick into Gryffindor before choosing Ravenclaw.

What is the sorting hats name?

Minerva McGonagall was what was considered a Hatstall, meaning the Sorting Hat took over five minutes to decide where to put her. Hatstalls were very rare. The Sorting Hat considered sorting Minerva McGonagall into Ravenclaw before choosing Gryffindor. Later, she became a teacher at Hogwarts and head of her old house.

Is the Sorting Hat ever wrong?

However, sometimes the Sorting Hat gets it wrong. Many of these 'incorrect' sortings could be attributed to choice. ... When Neville Longbottom was being sorted, he begged to be put into Hufflepuff, but the Sorting Hat refused his wishes and placed him in Gryffindor. Of course, it turned out the Hat was right.