Certainly, Nguyen is the one of first names of many people in Vietnam, only in Vietnam.
1	Certainly	certainly	ADV	RB	_	6	advmod	6:advmod	SpaceAfter=No
2	,	,	PUNCT	,	_	6	punct	6:punct	_
3	Nguyen	Nguyen	PROPN	NNP	Number=Sing	6	nsubj	6:nsubj	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	6:cop	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	6:det	_
6	one	one	NOUN	NN	Number=Sing	0	root	0:root	_
7	of	of	ADP	IN	_	9	case	9:case	_
8	first	first	ADJ	JJ	Degree=Pos|NumType=Ord	9	amod	9:amod	_
9	names	name	NOUN	NNS	Number=Plur	6	nmod	6:nmod:of	_
10	of	of	ADP	IN	_	12	case	12:case	_
11	many	many	ADJ	JJ	Degree=Pos	12	amod	12:amod	_
12	people	people	NOUN	NNS	Number=Plur	9	nmod	9:nmod:of	_
13	in	in	ADP	IN	_	14	case	14:case	_
14	Vietnam	Vietnam	PROPN	NNP	Number=Sing	12	nmod	12:nmod:in	SpaceAfter=No
15	,	,	PUNCT	,	_	14	punct	14:punct	_
16	only	only	ADV	RB	_	18	advmod	18:advmod	_
17	in	in	ADP	IN	_	18	case	18:case	_
18	Vietnam	Vietnam	PROPN	NNP	Number=Sing	12	nmod	12:nmod:in	SpaceAfter=No
19	.	.	PUNCT	.	_	6	punct	6:punct	_
