Tähti

Tähti is also Estonian. [noted -ed] The name day for Tähti in Estonia is October 19. Tähti is also sometimes used as a masculine name in Finnish and Estonian. However, it's more common for females. So, I think that the "Usage" of this name should be changed from "Finnish" to "Finnish, Estonian", and the "Gender" of this name should be changed from "Feminine" to "Feminine & Masculine". A Finnish surname derived from the Finnish and Estonian word Tähti meaning "star" exists, this surname is Tähtinen (see Tähtinen on Behind The Name Surnames Site for more info).

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Source: https://forebears.io/x/forenames/tähti

Also occasionally used in Estonia: https://www.stat.ee/public/apps/nimed/

I saw a girl from Estonia named this.

Really, are there people called this? The only name bearer I've ever heard of was a dog.