The suffix -i has been regarded as a gender-neutral morpheme that communicates affection in Spanish. Previous studies have shown this diminutive morpheme to be more productive in relation to female hypocorisms. There are, however, many Spanish proper names for which there exist pairs of alternative hypocorisms (e.g. Antonia > Toña/Toñi; Antonio > Toño/Toni). This paper compares the potentiality of the suffix -i to build hypocorisms for both genders with its actual use by Spanish speakers over a four-generation time spam from Baby Boomers to Generation Z. It explores the connections between its sound symbolism and its pragmatics in order to assess its alleged gender neutrality over time. The paper is organized as follows. First, the author considers previous literature on sound symbolism and gender, together with a description of the theoretical tools used in the present investigation. Second, the paper describes the methodological decisions adopted for the present research, which include the design of a survey to assess the gender neutrality of the actual use of the hypocorisms by Spanish speakers. The cohort of informants includes 30 men and 30 women from different generations (50% Baby Boomers / Generation X and 50% Millennials / Generation Z). Finally, the author reports and discusses the results of the survey. These point to a preference for hypocorisms in -i for female names. Differences also arise in the use of hypocorisms in -i in relation to the gender and age of the speakers, signalling an incipient diversion from the traditional use of hypocorisms in -i for female names in previous generations.