Forebears does point to it being used in Taiwan (
www.forebears.io/x/forenames/lanya). However, on LinkedIn, out of 1000 results, only 8 are in Taiwan (see
https://www.linkedin.com/search/results/people/?firstName=lanya&geoUrn=%5B%22104187078%22%5D). Forebears often has problems with Chinese names because the name order in Chinese is Surname Forename, so it might be one of those cases? I'm not sure, to be honest...