The ". register keeps track of the last inserted text in Vim. <C-r> followed by the name of a register in insert mode puts the contents of that register. Combining these two facts, we know that repeating the last inserted text can be done using <C-r>. in insert mode.
Try it in the editor. Type your name at the end of the first line, then use this trick to insert your name at the start of the second line.