Too similar? Rohan & Rosie?

[nickers]

i think Rohan and Rose would be ok but if you call ds Rohey and would call Rose Rosie it could get a bit confusing and be to close

[JoyMama]

thanks everyone!!
Rohan is growing up so less likely to be Rohey and more Ro. (he is almost 8)
There is no theme, my DS2 is Lucas.
We have a thirteen letter surname, so the shorter name the better. Even though we have liked Charlotte forever.