I do like [name_m]Thomas[/name_m] nn [name_m]Tuck[/name_m] but if you and your husband don’t love it that’s kind of a no go for me. [name_m]Theodore[/name_m] was also my first thought.
Here are some others that may suit the nn [name_m]Tuck[/name_m].
[name_m]Augusten[/name_m] -I absolutely love this with [name_m]Tuck[/name_m] for some reason.
[name_m]Alastair[/name_m]
[name_m]Arthur[/name_m]
[name_u]Elliot[/name_u]
[name_m]Fletcher[/name_m]
[name_m]Matthias[/name_m]
[name_m]Quentin[/name_m]
After reading this, you may feel better about using [name_m]Tucker[/name_m] as the formal name (taken from babynamespedia.com):
[name_m]Tucker[/name_m] is popular as a baby boy name, and it is also regarded as trendy. The name’s popularity has been increasing since the 2010s. At the modest height of its usage in 2012, 0.101% of baby boys were named [name_m]Tucker[/name_m]. It was #185 in rank then. Within all boy names in its family, [name_m]Tucker[/name_m] was the most commonly used in 2012.
[name_m]Atticus[/name_m] is a classic name. [name_m]Tucker[/name_m] sound like a family name and I think is fine too. [name_m]Thomas[/name_m] is clearly a classic. [name_f]My[/name_f] favorite of the 3 is [name_m]Atticus[/name_m], arguably the most courageous man in literature.