Hi
Not related.
On http://chroniclingamerica.loc.gov/
Select newspaper pages on left...click
On right, scroll down to Omaha Bee
On same page scroll down to search box & enter Moylan

1. 16 Jul 1898 image 12
"The following births were reported to the health commissioner during the 24 hours ending at noon yesterday...David Moylan 1923 S 19th Street, a boy (...Michael)

2. 7 Dec 1889, image 7
"REALTY MARKET...J M McMahon to David Moylan, n 1/2 lot 8, blk 3, Improvement association add, w d 1200."

On Ancestry city directories

Omaha
1890
Moylan D, fireman UP Ry, r 1712 S 6th

1898
Moylan, David, fireman UP Ry, r 1923 S 19
Moylan, Michael, r 1923 S 19
Moylan, Simon, r 1923 S 19

WWI
James M. Moylan
b 1 Nov 1892
911 S 36

Frank Joseph Moylan
b 24 Jul 1894
911 S 36

On http://omahamarriages.wordpress.com/mi-mn/
Moylan, Frank J, 30 md Anna Donalioe, 30 Jun 1923
Moylan, James M, 31 md Lucy Miller, 27; 24 Sep 1924
Moylan, Julia, 34 md Horatio DeHarport, 36; Nov 1900

This is the website for Greater Omaha Genealogy Society. Although there are several marriages, when birth index and obit index are checked, there are no entries for Moylan.

There are no Moylans listed in Forest Lawn index.

They seemed to have "disappered" sometime in the 1920's.