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Such connotations may well have been different in Pasternak's time. Nowadays "Yurochka" sounds too effeminate.

Yurochka (Юрочка) is how a fat wifie would call her effeminate poof of a son. A deminutive but in no ways pansified version of the name is Yurik (Юрик). At least that's what lads would say.