1.  Marriage Record:

2.  1900 Census Index/Images (online at Genealogy.com, Image #39 of 46):  421 Vine Street, Johnstown City (Ward 1), Cambria Co., PA, Roll 1388 (Book 2), p. 253A, SN 20, SD 13, ED 124, enumerated 7 Jun 1900, official enumeration date 1 Jun 1900 (extracted by Diana Gale Matthiesen):¤•

1900:  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

7

8

9

10

11

12

13

14

15

19

20

22

23

24

25

26

27

*

421

408

417

Stroup Catherine

Head

W

F

Mch 1826

74

Wd

8

5

PA

PA

PA

Y

Y

Y

O

M

H

______ Louis D

G-Son

W

M

Jul 1876

23

M

1

TN

PA

PA

Bricklayer

6

Y

Y

Y

______ Lenore

G-Dau

W

F

Apr 1880

20

M

1

1

1

PA

PA

PA

Y

Y

Y

______ Ardath

GG-Dau

W

F

May 1900

0/12

S

PA

PA

PA

Y

Y

Y

*Vine Street

Catherine (STEINER) STROUP is Lewis's paternal grandmother, who was of Jewish ancestry and was likely the source of Ardath's Hebrew name (it's not biblical). 

3.  Messages on the Wales — General Board (online at Ancestry.com), specifically a post by "Jeff":

Ardath [alternate spellings Ardith, Ardeth] is a name of Hebrew origin meaning Flowering Field.