The clue "First son of Isaac" last appeared in the The Washington Post crossword on May 2, 2019. The correct answer for this puzzle is "ESAU", a 4-letter word.
Solution ESAU is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is ESAU with 4 letters, and the shortest is ESAU with 4 letters.
No, "FIRST SON OF ISAAC" hasn´t seen a spike right now. Solvers are most interested in: Apportion, Comedian, Genetic twin, Unexpectedly quick and tire out.
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The solution is 4 letters long.