Pia

Also Romansh:
Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars
https://sursassiala.ch/2015/01/15/familienforschung/
https://nossaistorgia.ch/entries/j4gVkbL2ZYA
https://nossaistorgia.ch/entries/v78VqApnVW4
https://www.portraitarchiv.ch/portrait?page=86

Pia is also Polish. The name day for Pia in Poland is January 19.

Also occasionally used in Estonia: https://et.wikipedia.org/wiki/Pia_(eesnimi)

Also Polish: https://pl.wikipedia.org/wiki/Pia_(imi%C4%99)
https://pl.wikipedia.org/wiki/Pia_G%C3%B3rska

This could be a nickname for Olympia.

I am a Pia. I was born in North America and my parents have Danish and German heritage. I was the only Pia in school growing up and although I have heard of Pias throughout my adulthood, I still haven't actually met another Pia. I lived in Sweden for a few years and my husband knew at least two Pias at his work. I was able to find tons of merchandise with the name Pia on it in Denmark and Sweden. In the UK there is a jewelry shop named Pia.

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I occasionally get Pie-ah instead of the correct Pee-ah and I was teased a bit in school but so were my siblings and they have very common names. Overall though I have had little trouble with the name and hope more babies are given the name in the future.

My full name is Olympia but my nickname is "Pia". Olympia is a Greek name which means mountains but more specifically "home of the Gods" or Heaven. I think it's a cute name. If I wasn't a Pia, I would think that anyone who was named Pia is one who is cute, peppy and outgoing, just from the mere sound of it.

The name Pia was given to 94 baby girls born in the US in 2012. Im not so sure about this one.

Also used as a girls name in Slovenia.

To most Swedes this sounds like a nickname, not a proper name, but where Fia is short for Sofia, Pia doesn't have an equivalent.

This name isn't Polish! We even don't use it!

Kicia, it is rare name in Poland, but this doesn't mean that the name Pia isn't used there. I've known some Polish Pias. :)