The band Heart was born in Seattle, Washington in 1963. It was formed by bassist Steve Fossen and brothers Roger Fisher (guitar/mandolin) and Mike Fisher (producer and sound engineer).
While the question "Where was heart born?" could also refer to the biological organ, the provided references offer various contexts:
Heart (the organ):
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Congenital Heart Defects: Many references discuss congenital heart defects, meaning heart conditions present at birth. These defects vary widely in type and severity. For example, hypoplastic left heart syndrome (HLHS) is a rare condition where a child is born with an underdeveloped left side of the heart. https://www.mayoclinic.org/diseases-conditions/hypoplastic-left-heart-syndrome/symptoms-causes/syc-20350599 Another example is ectopia cordis, a rare condition where the heart is born outside the chest. https://www.texaschildrens.org/content/wellness/baby-born-with-heart-outside-body-ectopia-cordis-makes-history Congenital heart defects are the most common type of birth defect. https://www.marchofdimes.org/find-support/topics/planning-baby/congenital-heart-defects-and-critical-chds
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Location in the Body: Normally, the heart is located in the chest, pointing towards the left. However, in a condition called dextrocardia, the heart points towards the right. This condition is present at birth. https://medlineplus.gov/ency/article/007326.htm
In summary, while a physical heart is born in the body of a developing fetus, the location of the birth depends on the mother's location. The band Heart, however, was definitively born in Seattle, Washington.