Slavonian

Then some of them appear to be Slavonian; for example Mikailia and Pakomovna.
The Romany Rye|George Borrow
Then full and fast flow the tears, like melting snows of Apennine under Slavonian blast.
The Bridling of Pegasus|Alfred Austin
There are seats beneath the trees, overlooking the green turf and the flowers so dear to the Slavonian soul.
The Vultures|Henry Seton Merriman
They were accompanied by a miner named Jacques, and a Slavonian very skilful in discovering minerals.
The Makers of Canada: Champlain|N. E. Dionne

The Old-Slavonian began to take its stand among the languages compared from the second part onwards.
Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 2|Various

British Dictionary definitions for Slavonian

Slavonian

/ (sləˈvəʊnɪən) /

adjective

of or relating to Slavonia, a region in Croatia, or its inhabitants

noun

a native or inhabitant of Slavonia

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012