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I really think you are confusing them. Slovaks use the "-ia" forms, I think, but Czechs tend not to.

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Example: According to statistics, there are 332 918 MariEs and 3 826 MariAs in the Czech Republic. So it's hundred to one for "-iE".
You can find the statistics for females here:
http://www.mvcr.cz/sprava/informat/cetnost/2007/jmena_zeny/cet_jmena_zeny_vsechny.xls