It's not uncommon for Germans to have three given names.  Eva's surname in German is most commonly spelled GLASS (= GLAß), less commonly GLAS or GLAZ.  GLASE, GLACE, and GLAZE are Anglicized spellings.

— born in Susquehanna Twp., Juniata Co., PA:
4.  Lucinda STRAUB / STROUP, b. 1840
5.  Louisa STRAUB / STROUP, b. 1841/2
6.  Michael STRAUB / STROUP, b. 1843/4
7.  John/Jonathan STRAUB / STROUP, b. 1848/9; d. by 1854
8.  William STRAUB / STROUP, b. 1851/2
9.  John STRAUB / STROUP, b. 1853/4

1.  Marriage Record:

2.  Census Index:  U.S. Selected Counties, 1830 (Broderbund CD-315):  not found.

3.  1840 Census Index and Digital Images (online at Ancestry.com; Image #5 of 16; extracted by Diana Gale Matthiesen):¤•

1840

PA

Juniata Co.

Greenwood [now Susquehanna] Twp.

pp. 219B-220A

Ln. 30

Michael Stroub

110 001 - 100 010

0100000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	4 or under	1835-1840	= Abraham (b. 1837/8)
1 male	5-9	1830-1835	= Israel (b. 1835)
1 male	30-39	1800-1810	= Michael (b. 1809/10)
1 female	4 or under	1835-1840	= Catherine (b. 1833/4)
1 female	20-29	1810-1820	= Eve (b. 1810)
1	persons engaged in agriculture

Listed five lines from Moses STROUB/STROUP. 

4.  1850 Census Index/Images (online at Ancestry.com; Image #21 of 44 — indexed "Stroub"):  Greenwood [now Susquehanna] Twp., Juniata Co., PA, p. 312, 2041/2071, enumerated 4 Nov 1850 (extracted by Diana Gale Matthiesen):¤•

Michael Straub	40	M	Farmer	3000	Penna
Eve Straub	38	F			"
Cath Straub	16	F			"
Isreal Straub	14	M			"
Abram Straub	12	M			"
Lucinda Straub	10	F			"
Louisa Straub	8	F			"
Michael Straub	6	M			"
Jno Straub	1	M			"

5.  1860 Census Images (online at Ancestry.com; Image #328 of 430):  Susquehanna Twp., Juniata Co., PA, p. 796, 1631/1, PN 236, enumerated 2 Aug 1860 (extracted by Diana Gale Matthiesen):¤•

Michal Stroup	48	m		Farmer	500	400	Pennsylvania
Eve Stroup	48	f					"
Michael	15	m					"
Wm	8	m					"
John	6	m					"
Mary Glase	84	f		widow			"

6.  1870 Census Images (online at Ancestry.com; Image #8 of 23):  Mahontango P.O., Susquehanna Twp., Juniata Co., PA, p. 465B, PN 8, 50/50, enumerated 13 Aug 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤•

Stroup Michael	66	M	W	Farmer			Pa
______ Mary	61	F	W				Pa
______ Israel	31	M	W	at home			Pa
______ Kate	28	F	W	H $			Pa
______ Abraham	25	M	W	T $			Pa
______ William	20	M	W	Carpenter			Pa
______ John	18	M	W				Pa
______ Mary	16	F	W				Pa

It's very hard to figures this household.  Most likely, Kate is Israel's wife.  Why is Abraham back?  And is he their son (he's not the right age)?  Are these really our subjects?  This enumeration often used "$" in the occupation field, and I haven't a clue what it is intended to represent.  In general, this enumerator made a lot of mistakes in names and ages, so I wouldn't put too much stock in this record.  Listed next to John & Susanna (__?__) CUPP, in one direction; and, in the other direction, listed three households from Joel & Catharine (STROUP) DRESSLER. 

7.  1880 Census Images (online at Ancestry.com; Image #15 of 30):  Susquehanna Twp., Juniata Co., PA, p. 360A, PN 14, SD 7, ED 134, enumerated 10 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):¤•

1880:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).

1

2

3

4

5

6

8

9

10

13

22

23

24

25

26

12

14

Stroup Michael

W

M

68

/

Retired Farmer

/

/

PA

PA

PA

______ Eve

W

F

70

Wife

/

Keeping house

/

/

PA

PA

PA

Stroup Abram

W

M

42

/

Works on Farm

PA

PA

PA

[Abram's wife and children]

Listed next to John & Susanna (__?__) CUPP, who are next to Joel & Catharine (STROUP) DRESSLER.