Jana

From Czech Jana, ultimately from Koine Greek Ἰωάννα (Iōánna), from Hebrew יוֹחָנָה (Yôḥānāh, literally “God is gracious”), the feminized form of יְהוֹחָנָן (Yəhōḥānān) which produced John and its many doublets. As a placeholder name, cf. similar use of John and Jack and earlier use of Joan in the same role.
Doublet of Ivana, Jane, Janice, Janis, Jean, Jeanne, Jen, Joan, Joanna, Joanne, Johanna, Juana, Shavonne, Sian, Siobhan, Shane, Shaun, Shauna, and Sheena.