Am Australian (of mostly [name_m]Brit[/name_m] + Scandi heritage) so not a great help here in terms of your US context, but my view is that the nurse’s comment was a bit off even if it’s true that it’s not a typical Mexican boys’ name. Though it’s [name_f]English[/name_f], I see [name_m]Jack[/name_m] as pretty “international” and not “too white”. It’s a very friendly, affable and handsome name, including with [name_m]Antonio[/name_m]. It’s also solid name that is both a little rugged and a little debonair that works for all life stages. I wouldn’t change it. You son would also be internalising his name so unless you have a new name that incorporates [name_m]Jack[/name_m], I would be reluctant to change. [name_m]Jack[/name_m] [name_m]Antonio[/name_m] is a fabulous name.
[name_f][/name_f]Meanwhile, my daughter is [name_f]Willa[/name_f] and I occasionally hear myself when I say “Willa will….”. It’s not the same stakes as “Jack off”’but it’s still something I have accepted as an extra cost of the name. I wouldn’t let this stop you settling into and enjoying the name. When you’re texting and when you think of it, you can just change to “drop off Jack”. But I think you’ll start to let that one go [name_f][/name_f]- it’s really not a thing in the scheme of things. [name_f]My[/name_f] brother is a [name_m]Jack[/name_m] (from Jackson) and it’s never been mentioned (and we’re a teasing family 
).