Adding column in file

File contains 2 fields with tab delimeter. i want added the one column first of the file and incrementing as like sequence
Sample file:

Fname    lanme
raj    rajkumar
rani    ranikumar

output file should be.

name    Fname    lanme
1    raj    rajkumar
2    rani    ranikumar

Please help me...
Thanks,

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