The Data Interoperability Quick Export tool does not preserve field names from the attribute table of a feature class when exporting to the Excel format.
Last Published: August 19, 2020ArcGIS for Desktop
Bug ID Number
November 18, 2014
March 30, 2022
ArcGIS for Desktop
Will Not Be Addressed
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Use ArcToolbox > Conversion Tools > Excel > Table to Excel. The output format is .xls only, not .xlsx, but the field names are preserved. Other option is to use the field alias as the column header, domain and subtype descriptions.