Answer: geisel

AnswerCrossword Clue
GEISELDr. Seuss's surname
GEISELSeuss, actually
GEISELDr. Seuss
GEISELSeuss, at birth
GEISELYertle the Turtle creator Theodor
GEISELSeuss' real name
GEISELDr. Seuss's real last name
GEISELTheodor ... (Dr. Seuss)
GEISELSeuss's real last name
GEISELTheodor ... (Dr. Seuss's real name)
GEISELDr. Seuss' real surname