Estill rhymes with:
steal, steel, steele, steil, stiehl, genteel, steal, steel, steele, steil, stiehl, teal, teale, teall, teel, teele, vantil
Estill sounds like:
eastdil, ekdahl, estel, estell, estella, estelle, estle, exactly, excitedly, exquisitely, extel, extol