diff --git a/gds-render-gui.c b/gds-render-gui.c
index 7802013..2193066 100644
--- a/gds-render-gui.c
+++ b/gds-render-gui.c
@@ -691,19 +691,13 @@ static void on_select_all_layers_clicked(GtkWidget *button, gpointer user_data)
 	layer_selector_select_all_layers(gui->layer_selector, TRUE);
 }
 
-static void auto_naming_clicked(GtkWidget *button, gpointer user_data)
+static gboolean auto_naming_ask_for_override(GdsRenderGui *gui)
 {
-	GdsRenderGui *gui;
 	GtkDialog *dialog;
-	gboolean overwrite;
-	int dialog_result;
-	(void)button;
+	gint dialog_result;
+	gboolean overwrite = FALSE;
 
-	gui = RENDERER_GUI(user_data);
-
-	/* Don't do anything if the selector is empty. */
-	if (!layer_selector_contains_elements(gui->layer_selector))
-		return;
+	g_return_val_if_fail(RENDERER_IS_GUI(gui), FALSE);
 
 	/* Ask for overwrite */
 	dialog = GTK_DIALOG(gtk_message_dialog_new(gui->main_window, GTK_DIALOG_USE_HEADER_BAR, GTK_MESSAGE_QUESTION,
@@ -720,6 +714,25 @@ static void auto_naming_clicked(GtkWidget *button, gpointer user_data)
 	}
 	gtk_widget_destroy(GTK_WIDGET(dialog));
 
+	return overwrite;
+}
+
+static void auto_naming_clicked(GtkWidget *button, gpointer user_data)
+{
+	GdsRenderGui *gui;
+	gboolean overwrite = FALSE;
+	(void)button;
+
+	gui = RENDERER_GUI(user_data);
+
+	/* Don't do anything if the selector is empty. */
+	if (!layer_selector_contains_elements(gui->layer_selector))
+		return;
+
+	/* Ask, if names shall be overwritten, if they are not empty */
+	if (layer_selector_num_of_named_elements(gui->layer_selector) > 0)
+		overwrite = auto_naming_ask_for_override(gui);
+
 	layer_selector_auto_name_layers(gui->layer_selector, overwrite);
 }
 
diff --git a/include/gds-render/layer/layer-selector.h b/include/gds-render/layer/layer-selector.h
index a3d7535..d4a6871 100644
--- a/include/gds-render/layer/layer-selector.h
+++ b/include/gds-render/layer/layer-selector.h
@@ -130,6 +130,13 @@ void layer_selector_auto_name_layers(LayerSelector *layer_selector, gboolean ove
  */
 gboolean layer_selector_contains_elements(LayerSelector *layer_selector);
 
+/**
+ * @brief Get number of layer elements that are named
+ * @param[in] layer_selector Layer selector
+ * @return Number of layers with a name != NULL or != ""
+ */
+size_t layer_selector_num_of_named_elements(LayerSelector *layer_selector);
+
 G_END_DECLS
 
 #endif /* __LAYER_SELECTOR_H__ */
diff --git a/include/gds-render/output-renderers/cairo-renderer.h b/include/gds-render/output-renderers/cairo-renderer.h
index cceb692..78cec69 100644
--- a/include/gds-render/output-renderers/cairo-renderer.h
+++ b/include/gds-render/output-renderers/cairo-renderer.h
@@ -38,7 +38,7 @@ G_DECLARE_FINAL_TYPE(CairoRenderer, cairo_renderer, GDS_RENDER, CAIRO_RENDERER,
 
 #define GDS_RENDER_TYPE_CAIRO_RENDERER (cairo_renderer_get_type())
 
-#define MAX_LAYERS (300) /**< \brief Maximum layer count the output renderer can process. Typically GDS only specifies up to 255 layers.*/
+#define MAX_LAYERS (5000) /**< \brief Maximum layer count the output renderer can process. Typically GDS only specifies up to 255 layers.*/
 
 /**
  * @brief Create new CairoRenderer for SVG output
diff --git a/layer/layer-selector.c b/layer/layer-selector.c
index 4111731..0872c9c 100644
--- a/layer/layer-selector.c
+++ b/layer/layer-selector.c
@@ -822,12 +822,10 @@ void layer_selector_auto_color_layers(LayerSelector *layer_selector, ColorPalett
 	unsigned int color_count;
 	GdkRGBA color;
 
-	if (GDS_RENDER_IS_COLOR_PALETTE(palette) == FALSE || LAYER_IS_SELECTOR(layer_selector) == FALSE)
-		return;
-	if (global_alpha <= 0)
-		return;
-	if (GTK_IS_LIST_BOX(layer_selector->list_box) == FALSE)
-		return;
+	g_return_if_fail(GDS_RENDER_IS_COLOR_PALETTE(palette));
+	g_return_if_fail(LAYER_IS_SELECTOR(layer_selector));
+	g_return_if_fail(global_alpha > 0);
+	g_return_if_fail(GTK_IS_LIST_BOX(layer_selector->list_box));
 
 	le_list = gtk_container_get_children(GTK_CONTAINER(layer_selector->list_box));
 
@@ -898,4 +896,31 @@ gboolean layer_selector_contains_elements(LayerSelector *layer_selector)
 	return (layer_element_list ? TRUE : FALSE);
 }
 
+size_t layer_selector_num_of_named_elements(LayerSelector *layer_selector)
+{
+	GList *le_list;
+	GList *le_list_ptr;
+	LayerElement *le;
+	const char *layer_name;
+	size_t count = 0U;
+
+	g_return_val_if_fail(LAYER_IS_SELECTOR(layer_selector), 0U);
+
+	le_list = gtk_container_get_children(GTK_CONTAINER(layer_selector->list_box));
+
+	for (le_list_ptr = le_list; le_list_ptr != NULL; le_list_ptr = g_list_next(le_list_ptr)) {
+		le = LAYER_ELEMENT(le_list_ptr->data);
+		if (!le)
+			continue;
+		layer_name = layer_element_get_name(le);
+
+		if (layer_name && *layer_name) {
+			/* Layer name is not empty. Count it */
+			count++;
+		}
+	}
+
+	return count;
+}
+
 /** @} */