\version "2.19.80"


addOssiaName =                                                    
#(define-scheme-function (name padding) (markup? number?) 
  #{
    \override Staff.StaffSymbol.stencil = #(lambda (grob)
      (ly:stencil-combine-at-edge (ly:staff-symbol::print grob)
        X LEFT (grob-interpret-markup grob name) padding))     
  #})

  
\score {
  <<
    \new Staff = "Testing"
    \with { instrumentName = "Top"  }
    \relative c'' { c1 | c | c | c |  }
   
    \new StaffGroup
    \relative c'' {
      \new Staff \with { instrumentName = "Bottom"  }
      { c1 | c <<
      { c1 | d  }
     
      \new Staff \with { alignAboveContext = "Testing" }                               
          { \once \omit Staff.TimeSignature 
            \addOssiaName "Violin" 2
             c1 | b }
                    >>
      }
    }
  >>
}