DH and I were thinking of using the name Jay Arthur, but Jay sounds too much like a nickname to me. We're thinking of going with Jason Arthur now, and still using Jay as a nickname. I know people don't usually nickname the name Jason, so is it weird? Or are there basically no rules to nicknaming? We've gone through literally 2000 boy names and finally agreed on one, so hopefully it sticks.
Me: 29, DH: 31
Married: October 2014
Began TTC: April 2015
BFP #1: 9/18/15. EDD 5/18/16. MC 10/26/15. (9w)
BFP #2: 2/27/16. EDD 11/7/16. MC/D&E 4/20/16 (11w)
BFP #3: 9/22/16. EDD 5/29/17. DS born 4/24/17

BFP #4: 5/20/18. EDD 1/23/19.
Re: Jason with nn
I would definitely go for the full name, I think you could also get away with James as a given name if you don't love Jason
Baby #2 Due 3/7/20
Married: October 2014
Began TTC: April 2015
BFP #1: 9/18/15. EDD 5/18/16. MC 10/26/15. (9w)
BFP #2: 2/27/16. EDD 11/7/16. MC/D&E 4/20/16 (11w)
BFP #3: 9/22/16. EDD 5/29/17. DS born 4/24/17
BFP #4: 5/20/18. EDD 1/23/19.
TTC since September 2012
DD2: 9/12/13
Baby #3: Due January 2018
Me: 33 H: 36
Married: 12/14/13 DS: 1/29/09
BFP2: 10/9/15 MMC: 11/12/15
BFP3: 4/6/16 DD: 12/12/16