In season 2 of The Flash, you meet Earth 2 Harrison Wells and his daughter Jessie. However, she has no E1 doppelganger.
Most probably because Eobard Thawne killed Harrison Wells too early and took over the identity that Harrison Wells got no chance to bear a child. Also, there is no Harrison Wells in earth 38 mentioned yet or Supergirl in earth 1 etc etc. So it seems every earth don't have the same person's doppelganger.