These are geographic anagrams and anadromes.
Anagrams are rearrangements of the letters of another name or word.
Anadromes (also called reversals or ananyms) are other names or words spelled backwards.
Technically, a reversal is also an anagram, but the two are derived by different methods, so they are listed separately.
Place names created by anagramming fall into three distinct groups: [19] A few places names were constructed by arranging a preselected set of letters in an order that made a pronounceable name.