The best replacement for surrogate is gestational carrier.

The best alternatives to surrogate are rated as following:
★★★★★  gestational carrier
★★★  natural keys
★★★  proxy
★★  gestational
★  traditional surrogate
★  internal standard
  living will
  durable power of attorney
  natural key
  gestational surrogate
  carrier
  natural primary key
  surrogacy

Your alternative for surrogate is not listed? Suggest!
Speaking about surrogate, one probably shouldn't forget about ivf.

Other search terms related to surrogate and their ratings are:
★★★★★ ivf
You have in mind a companion for surrogate and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of surrogate in all years. Click on graph for more.
surrogate
gestational carrier
natural keys