Kacy is a girl's name of Irish origin meaning “Vigilant, watchful; Latin origin meaning "alert" or "observant".” With 2 syllables, it is short and easy to say. As of 2026, Kacy ranks #930 among girls' names in the United States and has held a steady level of popularity. Its highest US ranking was #624 in 1983.
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KAY-see
Phonetic spelling
Currently #930 among US baby names.
* Based on US Social Security Administration birth-registration data
Kacy means “Vigilant, watchful; Latin origin meaning "alert" or "observant".” It is a girl's name of Irish origin.
Kacy is pronounced KAY-see.
Kacy is most commonly used as a girl's name.
Kacy currently ranks #930 among girls' names in the United States.
Middle names that pair well with Kacy include Kacy Rose, Kacy Grace, Kacy Marie, Kacy Jane.
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