Background information Edit
Whatley was played by Patrick B. Egan, who was credited as Jiyar.
Although the character was identified in the credits as Jiyar, no reference to the name can be found in the script, which clearly established him as "Whatley," and likewise, in dialogue he was addressed by O'Brien specifically as "Whatley."
Furthermore, regarding the name "Whatley", the closed captioning did, however, spell the name slightly different, in this case as "Watley." This spelling was further used by the authors of the Star Trek Encyclopedia, who also speculated that he might be a descendant of the 23rd century lieutenant named Watley. (3rd ed., p. 557)