It seems a single profile, Sydney Smith, is currently conflating three different women: one brown-eyed brunette and two blue-eyed blondes. I wanted to ask whether the site currently has any system for differentiating the three? Is there no other method but the one brought up by OP, i.e. [Name (ig_handle)]? Is there something wrong with that method, since OP faced the problem of the IG handles being rejected?
chipperpip's post is no longer relevant because we used a different naming system at the time that had limitations and worked differently from the current one.
The way to split these profiles is to manually rename two of the women to a different name. This could be by adding an instagram handle to the end, like "Sydney Smith (instagramhandle)" or by adding a middle name. This won't transfer the subs, but such is life.