No, its origins are from Hebrew (Jewish) roots.
I really don't know what it means in Welsh, but the origin of the name Sarah is Hebrew and the meaning is "princess", sometimes qualified as Sarai, "my princess", as in the case of Abraham (compare rabbi, "my teacher"). The proper spelling for in welsh is "Sara"
The Welsh translation of "name" is "enw".
Freddy Welsh's birth name is Fred A. Welsh.
Mikey Welsh's birth name is Michael Welsh.
It doesn't appear to be a Welsh name and would not have a Welsh version.
Sara Sowles's birth name is Sara Dhyne.
Sara Sharon's birth name is Sara Alter.
Sara Sagal's birth name is Sara Zwilling.
Sara Franchetti's birth name is Sara Girgenti.
Sara Amato's birth name is Sara Amato.
Sara Biala's birth name is Sara Bialablotcky.
Sara Gold's birth name is Sara Goldgraben.