Castrénøyane is the name given to two small islands, Nordre Castrénøya and Søre Castrénøya (English: Northern and Southern Castrén Island), east of Chermsideøya, Svalbard.
Map of Castrenoyane, Jan Mayen Island
The islands were named after Matthias Alexander Castrén (1813–52), a Finnish linguist and traveller. The islands were visited by Swedish geologist O. M. Torell and Swedish geologist and Arctic explorer Adolf Erik Nordenskiöld in 1861.
References
Castrénøyane Wikipedia(Text) CC BY-SA