Your question has been asked before:
Artem Taturevych's answer:
here is no API for retrieving the sketch segments/points names.
You should use either the sketch point id instead:http://help.solidworks.com/2013/English/api/sldworksapiprogguide/overview/persistent_reference_ids.htm
or persist references:
Artem Taturevych, Application Engineer at Intercad (Australia)
translationXpert – add-in to translate SolidWorks models