This is the 321st most frequent Korean word.
이름을
"이름을" means "name" (as an object).
Here, '이름을' refers to the object of the verb '지었다', meaning specific allocation of a name.
제가 새로운 이름을 지었습니다.
I have come up with a new name.
'이름을' is the object that is being asked about in the sentence, showing its function in the query.
선생님은 저에게 이름을 물어보셨습니다.
The teacher asked me my name.
In this sentence, '이름을' is again used as the object affected by the action of 'changing' in the past tense.