Umashankar - Thiru is added as a prefex to holy places like Thiru Anna Malai (Thiruvannamali), Thiru Anantha Puram (Thiruvananthapuram), Thiru Chira palli (Thiruchirapalli) likewise...Malai and Achalam means hill.. Aruna Achalam (Arunachalam), Anna Malai (Annamalai)... hope your doubt is cleared to some extent.
