Hi Hai,
Name is the variable name - how the collected info for the question will be stored in the database (behind the scenes).
Label is the survey question and will appear in the survey.
You can reference a "name" as a variable and use it for other questions in your survey.
From the help doc, XLSForm essentials—Survey123 for ArcGIS | ArcGIS
FYI, these Survey123 tutorial videos are good resources: Survey123 - YouTube
Hope this helps,