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We show that the number of non-isotopic commutative semifields of odd order$p^{n}$ is exponential in $n$ when $n = 4t$ and $t$ is not a power of $2$. Weintroduce a new family of commutative semifields and a method for provingisotopy results on commutative semifields that we use to deduce theaforementioned bound. The previous best bound on the number of non-isotopiccommutative semifields of odd order was quadratic in $n$ and given by Zhou andPott [Adv. Math. 234 (2013)]. Similar bounds in the case of even order weregiven in Kantor [J. Algebra 270 (2003)] and Kantor and Williams [Trans. Amer.Math. Soc. 356 (2004)].

An exponential bound on the number of non-isotopic commutative semifields