The following statement should clarify the issue!
"Designation of Head-HR"
Anyone who is asked to "head" the HR function may be designated "Head-HR," but in terms of protocol, hierarchy, and levels of responsibilities and designations, even a Deputy Manager could be a "Head-HR," whether it is a designation formally assigned by the organization or not. Normally, the Head-HR is a designation more relevant to the "corporate" level and has a span of responsibility across the organization, whereas the Deputy Manager, etc., designations are more specific to the level in the hierarchy, level of responsibilities/accountability, and indicate a position at a location and as a "part" of the HR function/activity at the location.
In another dimension, there can be many Deputy Managers, but there shall be only a unitary position of "Head-HR," and that should highlight the significance of the designation in comparison with other designations and by itself.
When not enough thought is devoted to the relevance of the subject, new, fanciful designations are created and assigned. These could be quite misleading to the reality of the job profile assigned to an individual. And it does not happen only in HR; it's a phenomenon across organizations irrespective of technology, culture, or nature of the organization!
In choosing designations that are appropriate to the reality in terms of the level in the hierarchy, job profile, extent of authority, and accountability, you have to take the call and make up your mind. I am happy to see your concern and would suggest that you think rationally and make a decision.
Good luck!
Regards,
Samvedan
December 30, 2012