How to fill a column with data from the column of 2 other tables?

I have the following tables:

TABLE A:

ID NOMBRE

1   A 

2   B 

3   C

and TABLE B :

ID  NOMBRE

1   D 

2   E 

and I want to insert the data from the "name" columns of both tables in the "name" column of a third table ( TABLE C ).

and I have something like this:

TABLE C

ID  NOMBRE

1   A 

2   B 

3   C

4   D

5   E

I have to clarify that the 3 tables have the same structure. Thanks in advance for the help.