Hmm, is this lib GDPR compliant?

If this isn't compliant than neither are name day calendars or baby name websites.

It's not a privacy issue if it's just "someone's" name.

There are a relatively finite number of Icelandic names. https://en.wikipedia.org/wiki/Icelandic_Naming_Committee

> A name not already on the official list of approved names must be submitted to the naming committee for approval. A new name is considered for its compatibility with Icelandic tradition and for the likelihood that it might cause the bearer embarrassment. Under Article 5 of the Personal Names Act, names must be compatible with Icelandic grammar (in which all nouns, including proper names, have grammatical gender and change their forms in an orderly fashion according to the language's case system).

A database of those names is no more interesting or personal than a dictionary or list of names ( https://www.insee.fr/en/statistiques/6536067 ) in another language... which is where they got the data.

> Iceland has a publicly run institution, Árnastofnun, that manages the Database of Icelandic Morphology (DIM). The database was created, amongst other reasons, to support Icelandic language technology.

https://bin.arnastofnun.is/DMII/aboutDMII/

There is no more personal information being presented than saying John or providing https://en.wikipedia.org/wiki/John_(given_name) or https://www.wolframalpha.com/input?i=John

John may be your given name, but that data isn't personal data. One of the numbers 1969, 1978, 1987, 1996 might be your birth year... but https://oeis.org/A101039 isn't personal information either. Combining John with Smith and 1978 as the year of someone's birth... now you've got personal information that would be covered by the GDPR.

Why wouldn't it be?

GDPR is about accountability for handling identifiers like full name of actual person. Using parts of names, where each part does not identify any particular person, in generalized list like described here does not fall under GDPR.