diff --git a/src/polish_names.jl b/src/polish_names.jl
index f71500f..31cc037 100644
--- a/src/polish_names.jl
+++ b/src/polish_names.jl
@@ -42,6 +42,8 @@ end
 Return a vector of symbols containing new names that are unique and formated using the `style` selected.
 """
 function generate_polished_names(names; style::Symbol=:snake_case)
+    names = _preprocess_name.(names)
+    
     return generate_polished_names(names, Style(style))
 end
 
@@ -50,7 +52,7 @@ function generate_polished_names(names, ::Style{:snake_case})
 
     for name in names
         new_name = _sanitize_snake_case(
-            join(split(_replace_uppers(String(name)), SPECIAL_CHARS; keepempty=false), "_")
+            join(split(_replace_uppers(name), SPECIAL_CHARS; keepempty=false), "_")
         )
         push!(new_names, new_name)
     end
@@ -63,7 +65,7 @@ function generate_polished_names(names, ::Style{:camelCase})
 
     for name in names
         new_name = lowercasefirst(
-            join(uppercasefirst.(split(String(name), SPECIAL_CHARS; keepempty=false)), "")
+            join(uppercasefirst.(split(name, SPECIAL_CHARS; keepempty=false)), "")
         )
         push!(new_names, new_name)
     end
@@ -75,6 +77,17 @@ function generate_polished_names(names, ::Style)
     return error("Invalid style selected. Options are :snake_case, :camelCase")
 end
 
+function _preprocess_name(name)
+    preprocessed = String(name)
+
+    matched = match(r"^[[:upper:]]+$", preprocessed)
+    if matched !== nothing
+        return lowercase(preprocessed)
+    end
+
+    return preprocessed
+end
+
 function _replace_uppers(word)
     fixed_word = ""
 
diff --git a/test/test_polish_names.jl b/test/test_polish_names.jl
index c3c0d34..e77b74d 100644
--- a/test/test_polish_names.jl
+++ b/test/test_polish_names.jl
@@ -33,6 +33,7 @@ using DataFrames: DataFrame
             "  _aName with_loTsOfProblems",
             "  _aName with_loTsOfProblems_1",
             "  _aName with_loTsOfProblems_1_a/b'c",
+            "ID",
         ];
         style=:snake_case,
     ) == Vector{Symbol}([
@@ -40,6 +41,7 @@ using DataFrames: DataFrame
         :a_name_with_lo_ts_of_problems_1,
         :a_name_with_lo_ts_of_problems_1_1,
         :a_name_with_lo_ts_of_problems_1_a_b_c,
+        :id,
     ])
 
     @test generate_polished_names(
@@ -49,6 +51,7 @@ using DataFrames: DataFrame
             "  _aName with_loTsOfProblems_1",
             "  _aNameABC with_loTsOfProblemsDEF",
             "  _aNameABC with_loTsOfProblemsDEF_a/b'c",
+            "ID",
         ];
         style=:camelCase,
     ) == Vector{Symbol}([
@@ -57,6 +60,7 @@ using DataFrames: DataFrame
         :aNameWithLoTsOfProblems1,
         :aNameABCWithLoTsOfProblemsDEF,
         :aNameABCWithLoTsOfProblemsDEFABC,
+        :id,
     ])
 
     let err = nothing