Hello! 
You can find their declension patterns on our website: 
For masculine nouns: Declension I
"Игорь" has the same endings as "житель"
"Николай" has the same endings as "герой"
For Наталия: Declension II
This noun has the same endings as "Мария". Note that the name Наталья is declined like "героиня"
Thus, those names will have the following forms
Nom:		Игорь,	Николай,	Наталия 	
Gen:		Игоря,	Николая,	Наталии 	
Dat:		Игорю,	Николаю,	Наталии 	
Acc:		Игоря,	Николая,	Наталию 	
Ins:		Игорем,	Николаем,	Наталией 	
Prep: о(б)	Игоре,	Николае,	Наталии 	


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