diff --git a/dist/ROI.php b/dist/ROI.php
index f1e99f2..43f68ff 100644
--- a/dist/ROI.php
+++ b/dist/ROI.php
@@ -318,7 +318,7 @@ $allYears = [];
 // Auftragsbasierte "Slots" (direct/incl) pro Produkt
 $slotAgg = [];
 
-function ensureMeta(Epirent $Epi, int $productPk, int $productNo, string $title): void {
+function ensureMeta(Epirent $Epi, int $productPk, int $productNo, string $title, string $invoiceDate = ''): void {
     global $meta;
     if (!isset($meta[$productPk])) {
         $p = getProduct($Epi, $productPk);
@@ -326,8 +326,19 @@ function ensureMeta(Epirent $Epi, int $productPk, int $productNo, string $title)
             'product_pk' => $productPk,
             'product_no' => $productNo ?: (int)($p->product_no ?? 0),
             'title'      => $title ?: (string)($p->name ?? ''),
+            // titles: [title => letztes invoice_date, an dem dieser Titel auftauchte]
+            'titles'     => [],
         ];
     }
+
+    // Titel-Historie: nur Titel erfassen, die tatsächlich auf einer Rechnung standen,
+    // damit Umbenennungen (gleiche Artikelnummer, neuer Name) sichtbar bleiben.
+    if ($title !== '' && $invoiceDate !== '') {
+        $prev = $meta[$productPk]['titles'][$title] ?? '';
+        if ($invoiceDate > $prev) {
+            $meta[$productPk]['titles'][$title] = $invoiceDate;
+        }
+    }
 }
 
 function addRevenue(array &$pivotRef, int $productPk, int $year, float $revenueNet): void {
@@ -617,7 +628,7 @@ function processLineItem(
     $dateStart = safeYmd((string)($li->date_start ?? '')) ?: null;
     $dateEnd   = safeYmd((string)($li->date_end ?? '')) ?: null;
 
-    ensureMeta($Epi, $productPk, $productNo, $title);
+    ensureMeta($Epi, $productPk, $productNo, $title, $invoiceDate);
 
     // Jahr: Rechnungsdatum
     $year = $invoiceYear;
@@ -828,10 +839,23 @@ $pivotRows = [];
 foreach ($meta as $productPk => $m) {
     $productPk = (int)$productPk;
 
+    // Titel-Historie auswerten: neuester Titel als Hauptname, restliche als "früher"-Liste
+    $titlesMap = $m['titles'] ?? [];
+    if (!empty($titlesMap)) {
+        arsort($titlesMap); // nach letztem invoice_date absteigend
+        $orderedTitles = array_keys($titlesMap);
+        $newestTitle   = (string)$orderedTitles[0];
+        $olderTitles   = array_slice($orderedTitles, 1);
+    } else {
+        $newestTitle = (string)($m['title'] ?? '');
+        $olderTitles = [];
+    }
+
     $row = [
         'product_pk' => $productPk,
         'product_no' => (int)($m['product_no'] ?? 0),
-        'title'      => (string)($m['title'] ?? ''),
+        'title'      => $newestTitle,
+        'older_titles' => $olderTitles,
         'years'      => [],
         'years_ext'  => [],
         'total_direct'=> 0.0,
@@ -1179,7 +1203,22 @@ function slotsToDisplay(array $slotMap): array {
                                     <tr>
                                         <td class="mono"><?php echo (int)$r['product_pk']; ?></td>
                                         <td class="mono"><?php echo (int)$r['product_no']; ?></td>
-                                        <td><?php echo htmlspecialchars((string)$r['title']); ?></td>
+                                        <td>
+                                            <?php echo htmlspecialchars((string)$r['title']); ?>
+                                            <?php if (!empty($r['older_titles'])):
+                                                $ttHtml = 'Frühere Namen:<br>&bull; ' .
+                                                    implode('<br>&bull; ', array_map(
+                                                        fn($t) => htmlspecialchars((string)$t, ENT_QUOTES),
+                                                        $r['older_titles']
+                                                    ));
+                                            ?>
+                                                <i class="fas fa-info-circle text-muted ml-1 js-name-history"
+                                                   style="cursor: help;"
+                                                   data-toggle="tooltip"
+                                                   data-html="true"
+                                                   title="<?php echo htmlspecialchars($ttHtml, ENT_QUOTES); ?>"></i>
+                                            <?php endif; ?>
+                                        </td>
 
                                         <td class="nowrap">
                                             <?php echo $peakDirect; ?>
@@ -1499,11 +1538,23 @@ function openSlots(title, payload) {
     $('#slotsModal').modal('show');
 }
 
+function attachTooltips(context) {
+    $(context || document).find('[data-toggle="tooltip"]').each(function() {
+        if (!$(this).data('bs.tooltip')) {
+            $(this).tooltip({ container: 'body', html: true, boundary: 'window' });
+        }
+    });
+}
+
 $(function() {
     // scrollX: DataTables kümmert sich selbst um horizontales Scrollen der Tabelle,
     // damit Search/Length/Pagination NICHT mit dem Scrollbalken mitwandern.
-    $('#pivotTable').DataTable({ pageLength: 50, order: [[4,'desc']], scrollX: true });
-    $('#detailTable').DataTable({ pageLength: 50, order: [[1,'desc']], scrollX: true });
+    const pivotDT  = $('#pivotTable').DataTable({ pageLength: 50, order: [[4,'desc']], scrollX: true });
+    const detailDT = $('#detailTable').DataTable({ pageLength: 50, order: [[1,'desc']], scrollX: true });
+
+    // Tooltips (z.B. für Namens-Historie) auch nach Pagination/Sortierung erneut anhängen
+    pivotDT.on('draw', () => attachTooltips('#pivotTable'));
+    attachTooltips();
 
     $(document).on('click', '.js-hist', function() {
         const title = $(this).data('title') || '';