Following are some examples of X-ray source names and where they came from. It's in the constellation Scorpius. This is another source that's named after its constellation. Usually, names of this form use a letter of the alphabet to order the stars in a constellation by optical brightness. In this coordinate system, the center of our Galaxy is defined as 0,0.
Many objects get their names from a reference number in a catalog.
Although these catalogs are often ordered by RA and Dec, one can't tell from the reference number where the object is in the sky. Mrk 297 Appears in B. E. Markarian's ultraviolet catalog of galaxies. Sometimes listed as Mkn instead of Mrk. Zw 18 First Zwicky Catalogue of Clusters of Galaxies. The Zwicky clusters were identified by F. Zwicky in 560 POSS fields.