It depends on whether they fit into Russian grammatical paradigms. If they do, they tend to be declined even if official rules forbid so -- not only female names, but any word in general. For example, Russian word "пальто", adopted from French "paletot", officially doesn't decline, but in colloquial speech is freely declined as a neuter noun, even while French word is masculine.
no subject
Date: 2007-09-26 03:31 am (UTC)no subject
Date: 2007-09-26 04:36 am (UTC)e.g. Руфь - Руфи (dative and genitive), о Руфи (prepositional)
no subject
Date: 2007-09-26 05:33 am (UTC)no subject
Date: 2007-09-26 06:53 am (UTC)no subject
Date: 2007-09-26 07:06 pm (UTC)no subject
Date: 2007-09-26 04:07 am (UTC)no subject
Date: 2007-09-26 04:29 am (UTC)no subject
Date: 2007-09-26 05:32 am (UTC)no subject
Date: 2007-09-26 06:42 am (UTC)no subject
Date: 2007-09-26 07:03 am (UTC)But that's right, those are very likely to be declined.