bob   schmuckatelli
jane  doe

id  Fname  Lname   addr          something
214 jack   frost   444 snow rd   data   data

$file = fopen('names.txt','r'); //change to whatever name it is
$firstname = ''; $lastname = ''; $index = -1; $id = -1;
$tab = '   '; //change this to the delimiter, of course
while ($line = fgets($file)) {
    $index = strrpos($line, $tab);
    $firstname = substr($line, 0, $index);
    $lastname = substr($line, $index + strlen($tab));
    $id = $sql->query("SELECT id FROM db_name WHERE Fname='" . $firstname . "' AND Lname='" . $lastname . "'");//query the firstname/lastname. Change db_name to whatever and I'm assuming you don't need to sanitize.
    //do something with the id?
}
fclose($file);

id    fname    lname    addr   age
N    michael  jordan   N     N