Family name Grna (Grna 
) , in all the world, is a rare cognomen. The last name Grna is habitual in Latvia, where it is a rare surname, Czechia, and Germany, where it is a very rare surname. Measured by absolute frequency, it is commonest in Czechia, Germany, and the United States. Much more frequently, Grna is the forename as well as the last name.
Ewa, Henryka, Izabela, Urszula, Marianna, Stefania, Czeslawa, Bogumila, Krystyna, Gertruda, Genowefa, Leokadia, Elzbieta, Wieslawa, Magdalena, Miroslawa, Agnieszka, Katarzyna, Kazimiera, Malgorzata, Stanislawa, Aleksandra, Jolanta, Jadwiga, Grazyna, Barbara, Anna, Maria, Alina, Beata, Hanna, Irena, Iwona, Wanda, Zofia, Sabina, Bronislawa, Alicja, Bozena, Renata, Danuta, Dorota, Lucyna, Janina, Joanna, Teresa, Halina, Helena, Aniela, and Wladyslawa