Do you mean the file name that you download from envelope which is completed can customize?
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Hi @Bristi,
Thanks for posting your question!
I understand you're looking for the ability to automatically personalize file names when using bulk send. Currently, this specific feature is not available, we apologize. We know this might be a limitation for your needs, and we encourage you to consider submitting this as a suggestion on our Ideas board
Submit a feature request. That’s where ideas from Docusign users like you can submit ideas to improve Docusign’s features, and where you can also vote on ideas from other members.
I found a similar request where you can show your support by voting and adding a comment to expand the request: Custom File Naming Format for Downloaded Documents | Community
However, you may consider this potential workaround using the email subject line:
First, customize the email subject and title for each envelope generated. Add merge fields and envelope custom fields (ECF) to include recipient data in the email subject.
Example: Use the recipient role and merge fields to automatically insert the recipient's name or other details into the message subject.
Here are the articles:
To add merge fields to a template message subject
To create a template with merge fields for bulk send
Custom Fields for Envelopes
When downloading the completed envelope as a single file (Combine all PDFs into a single file), the filename of the PDF will match the envelope's email subject. However, if you download the envelope as separate PDFs (through a .ZIP file), the filename will default to the original PDF name, which cannot be automatically modified.
I hope this is helpful. Let us know if you have questions or if anything comes up. We're here for you!
Regards,
Melanie | Docusign Community Moderator
If this helped, feel free to click "Best Answer"!
Hello @Bristi
How are you? We’d like to know if the suggested solution was helpful. If yes, can you please mark it as "Best Answer ✅"? This helps other community members with similar questions find the solution more easily. 
Let us know if you still need further assistance, we're here for you!
Sincerely,
Melanie| Docusign Community Moderator
Helpful? Feel free to hit “Best Answer” so others can benefit too!