Designations - Job Titles - Whats In A Name ?

Whats in a Title ?
We come accross many different designations alloted to personnel in our departments.
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HR Assistant
HR Coordinator
HR & Admin Coordinator
Executive HR
HR Executive
Senior HR Executive
Senior HR & Admin
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Manager HR
HR Manager
Manager Admin & HR
Manager HR & Training
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Why there are so many titles. What exactly are the roles & responsibilties hierarchy wise in an HR Dept.
can anyone draw a simple and idealistc Structure for positions in an HR Dept.
Thanks
sajid

What I understand is that the titles should be more relevant to the roles being played. The role an individual is handling under an HR Dept should be highlighted form the title itself rather than giving a generalized title for all admin work.

Hi Sajid,
According to me, a title represents the position, authority and the role that individual is playing the company.
Regards,
Jessie J