Miami-Dade Sheriff's Office

Gloria Estefan 's daughter's partner has been arrested for robbery ... and, it appears Emily Estefan is the alleged victim -- though cops are not revealing a name at this time.

Gemeny Hernandez -- who has been in a relationship with Emily Estefan for years -- was arrested Tuesday for felony strong-arm robbery and misdemeanor battery ... and the arrest affidavit identifies her domestic partner of eight years as the alleged victim. Getty

While cops have redacted the name of the victim, Emily and Gemeny celebrated their eighth anniversary together last year, according to multiple reports .

The police -- citing a sworn statement from the alleged victim -- say Gemeny struck the victim in the head with a phone during an argument.

Authorities say the t

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