Where is Lucy?还是Where is the Lucy?

Where is Lucy?

当特指的时候用后面那个

但是一般情况下 都用前面的那个

是Where is Lucy?
人名前一般不用冠词

Where is Lucy?人名前不用加the

Where is Lucy?

人名前面不加the

要看语境，看前文或者后问有没有交待，不过不加情况不大，要么加a 要么加the