How to Write same Gene name in column with strain identifier!

Question

[Info.shi]

I want to create a matrix according to NJ format. Gene name will be the same strain name should be different-

My current matrix is as follows-

#Gene.10008

     [1           2          3          4  5]
[1]            
[2] 0.06833713            
[3] 0.08513480 0.016797675           
[4] 0.10196239 0.033625257 0.016827582          
[5] 0.07741386 0.009076726 0.007720949 0.02454853 

I want my output as follows-

#Gene.10008

[1] #Strain1_Gene.10008

[2] #Strain2_Gene.10008

[3] #Strain3_Gene.10008

[4] #Strain4_Gene.10008

[5] #Strain5_Gene.10008

     [1           2          3          4  5]
[1]                  
[2] 0.20130806         
[3] 0.08605846 0.11524960         
[4] 0.03913092 0.16217714 0.04692754         
[5] 0.21139563 0.01008757 0.12533718 0.1722647 

Thank you so much!