Change the name with the random names in a text file

[Amaninder Singh]

Hi Guys,
I am fairly new to the language and programing. I am trying to solve a
problem in a text file. Where names are something like in this  manner
[**Name2 (NI) 98**]

[**Last Name (STitle) 97**]
 [**First Name4 (NamePattern1) 93**]
[**Last Name (NamePattern1) 94**]
([**Name (NI) 95**])
 [**Last Name (un) 96**]
I am trying to change these with random names.
Any ideas or how should I do it.
Any help appreciated.
Thank in advance