Proto-Indo-European Roots

Root/Stem: *ger-
Meaning:  crane
Hellenic Greek geranos 'crane'
Italic Latin grs, gen. gruis 'crane'
Celtic Welsh & Cornish & Breton garan 'crane'
Armenian Armenian kerunk 'crane'
Germanic Common Germanic *kranaz 'crane' >
Old High German krano, Middle Dutch crne, Old English cran
Baltic Common Baltic *gerav- 'crane', *geran- 'stork' >
Lithuanian garns 'stork', gerve. 'crane', Latvian dzerve 'crane', Old Prussian gerwe
Slavic Common Slavic *z'erv, *z'eravj 'crane' >
Ukranian zhuravel', Belorussian zhorov, Russian zhuravl', Bulgarian & Serbo-Croatian & Czech z'erav, Slovak z'erjav
Notes: The crane lives all over Eurasia, and was obviously known by Proto-Indo-Europeans. The word, however, does not exist in Indo-Iranian, which can be maybe explained by the fact that a lot of names for animals and birds were borrowed from aboriginal languages of Asia. 
The initial consonant is a pure *g, not a palatal variant: only in Slavic, it was turned into z' [zh] due to the palatalization law in the Common Slavic language.