<select name="Geschaeftsjahr">  
 
$sql = "select distinct gj AS Geschaeftsjahr from Personendaten";   
$result = mysql_query($sql) OR die(mysql_error());   
while($row = mysql_fetch_assoc($result)) {  	 
echo("<option>".$row['Geschaeftsjahr']."</option>");    
} 

<select name="Name">  
 
$sql = ("SELECT CONCAT(PF1,' --- ',PF3,' / ',PF4) AS Name FROM Personendaten Where `gj` LIKE('$Geschaeftsjahr')") or die('Nicht vorhanden');  
$result = mysql_query($sql) OR die(mysql_error());   
while($row = mysql_fetch_assoc($result)) {  	 
echo("<option>".$row['Name']."</option>");    
} 

echo($Geschaeftsjahr); 

echo($sql);