* A misspelling: Perhaps you meant "tea" (té in Spanish).
* A nickname: It could be a shortened form of a Spanish name like "Tatiana" or "Taylor."
* An English word: You might be referring to the English word "tay" as in "go for a tay" (go for a walk), but it's not a common word in Spanish.
To help me understand your question better, please provide more context. What were you reading or hearing that used the word "tay"?