If in Unix, no need for Perl:
$ cat file1.txt
New_York  South_Street  334473
Los_Ange  West_Street   829839
Californ  North_Street  748723
$
$ cat file2.txt
David
John 
Mathew
$
$ paste file2.txt file1.txt  # separate with "\t"
David    New_York  South_Street  334473
John     Los_Ange  West_Street   829839
Mathew    Californ  North_Street  748723
$
$ man paste  # please read

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In reply to Re: Adding row from other file by repellent
in thread Adding row from other file by ashnator

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