Surnames

[Dušan]

This doesn't detect Serbian language at all even for most possible Serbian names. Only Bosnian language instead.

It detects Serbian language if words are written in Cyrillic alphabet.

In my case, both surnames written on Cyrillic alphabet - Serbian, on Latin alphabet - Bosnian.

[InfamousAngel99]

There are multiple places of origin for my surname, and I haven't traced where my ancestors came from before they settled in the US so I can't say for sure if the origin is right or wrong.
However, my mother's maiden name is correct—Norwegian.

[calxpal]

Fathers surname: French (correct)
Mothers surname: English (correct I guess, It's Gaelic)

[andre]

Father: Kannada
Mother: Samoan

Nice.

[Beowulf]

Paternal: Spanish ( guessed correctly )

Maternal: English (not correct)

[meliton]

Father - Polish
Mother - Basque

Both wrong

[Cybele]

Maternal – Corsican (wrong, the origin is Greek)
Paternal- Romanian. When I write it the way I’ve seen this surname written in old documents, it says Polish.

[Nausevar]

On detectlanguage.com
Father: Serbian (it's almost an only Serbian surname, curiously a shorter version is exclusively Croatian, and I saw another similar version among Jews from eastern europe)
Mother: Croatian (it's a common surname both among Croats and Serbs)

[Saba]

Father: Arabic
Mother: Arabic

This is when I wrote it in perso-arabic script. Both make sense I suppose.

When written in Latin script I got Swahili for my father and Hindi for my mom.

[Chron]

Mother:
English (wrong)

Father:
Latin script: Slovenian (wrong)
Cyrillic: Russian (wrong)

Nice

Edit: BUT, if I give it an extra o in between two of the letters, which might actually be the original spelling, it says Bulgarian. So that's something, I guess.