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GeekyAkshayGeekyAkshay 

is it possible to increase length of Standard FirstName and LastName Fields on User Object ?

Right now FirstName Supports only 40 characters, we want it to support at least 120 characters.

User-added image

Khan AnasKhan Anas (Salesforce Developers) 
Hi Akshay,

Greetings to you!

You can't change the length of the name field. You could create another field which will store the actual value and copy only the first name or the last name in your standard name field. 

There are some ideas related to this, you can also upvote these ideas.

https://success.salesforce.com/ideaView?id=08730000000Bpi0AAC

https://success.salesforce.com/ideaView?id=08730000000kowTAAQ

https://success.salesforce.com/ideaView?id=08730000000h6uDAAQ

I hope it helps you.

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future. It will help to keep this community clean.

Thanks and Regards,
Khan Anas