There are a few job titles that start with the letter "X," and they are among the least common in the alphabet. These jobs can be found in various industries, including healthcare, engineering, science, and music. Some examples of jobs that start with X are xenobiologist, xenolinguist, and x-ray technician. Other job titles include x-ray technologist, x-ray inspector, x-ray consultant, x-ray engineer, xerophilist, xylographer, and xylophonist.