Sunderland-born Keillor-Dunn scored 35 goals in 78 appearances during his time with Barnsley.
“There was something that made me think in my heart that I would probably come back here,” he added.
“The way the club is progressing at the minute, there’s no better time to come. Just to get in the building and through the door, I can’t tell you how happy I am.”
Leeds-born Cadamarteri has scored twice in 30 games for Wednesday during this campaign, while he has also won four caps – and scored once – for Jamaica having opted to play for the Reggae Boyz after representing England at youth level.
Discussing Cadamarteri’s arrival, Wrexham manager Phil Parkinson said: “We’re delighted to welcome Bailey to the club.
“He’s played a lot of Championship football this season and we look forward to him joining up with the squad.”
With two forward arrivals on deadline day, Wrexham allowed summer signing Ryan Hardie to join League One promotion-hopefuls Huddersfield Town on loan.
Harry Ashfield has sealed a loan move to Cheltenham Town, with striker Mo Faal joining the midfielder in moving to the League Two club on a temporary basis.
Cadamarteri, who joined Wednesday when aged nine, made his league debut for the Owls aged 18 in November 2023.
The 20-year-old scored five goals in 25 appearances in the 2023-24 season before netting eight times in 31 games during a loan spell at League One Lincoln City last season.
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