There are 1 interjection starting with A, 1 interjection starting with B, 1 interjection starting with G, 3 interjections starting with H. Additionally, 2 interjections starting with N, 3 interjections starting with O, 1 interjection starting with P, 1 interjection starting with T. Only 1 interjection starting with U, while 2 interjections starting with W, 4 interjections starting with Y, 4 interjections starting with Z. In total, there are 24 interjections across all letters.