// Strip parenthetical and quoted nicknames so "James (Neal) Conrad"
            // and "Bruce (Bernadette) Weinberg" match the same as the plain name.
            $cleanName = preg_replace('/\([^)]*\)/', ' ', $caller['caller_name'] ?? '');
            $cleanName = preg_replace('/"[^"]*"/', ' ', $cleanName);
            $cleanName = trim(preg_replace('/\s+/', ' ', $cleanName));
            $nameParts = $cleanName !== '' ? preg_split('/\s+/', $cleanName) : [];
            $cleanFirst = $nameParts[0] ?? '';
            $cleanLast = count($nameParts) > 1 ? end($nameParts) : ($caller['caller_last'] ?? '');
            $lastPrefix = strtoupper(mb_substr($cleanLast, 0, 4));
            $firstInitial = $cleanFirst !== '' ? strtoupper(mb_substr($cleanFirst, 0, 1)) : '';