Actually the name "Antía" comes from the Greek form of "anthos" that derived in the name "Anthea" which means Spring or Bloom. For this reason we can find in Greek mythology the name of Anthea as a Spring's godhead. It isn't a Galician form of Anthony, in Galician language we have another form for this name which is Antón (for men) and Antona (for women). For historical reasons, the area of Galicia, in the Spanish northwest, remained isolated from the rest of the country so we just find the name in this zone. However, it exist a form of the name in English which is Anthia. We can see that this form didn't lost the "h" traditional.
It isn't a Galician form of Anthony, in Galician language we have another form for this name which is Antón (for men) and Antona (for women).
For historical reasons, the area of Galicia, in the Spanish northwest, remained isolated from the rest of the country so we just find the name in this zone. However, it exist a form of the name in English which is Anthia. We can see that this form didn't lost the "h" traditional.