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sultansultan 

How to avoid duplicate names through validation rules?plz help me?

Ana Catarina BritesAna Catarina Brites
Hello Raju, 

Is this field a custom one? If so you can use the Unique setting on the fild. 
If not try use the VLOOKUP function on the validation rules formula.

Hope it helps.

Regards, 
Ana Catarina Brites
Ramu_SFDCRamu_SFDC
Below link explains about this

https://www.interactiveties.com/blog/2013/salesforce-vlookup-function.php#.U7qm5vlmOo1