https://community.servicetitan.com/t5/General-Office/Why-United-Policy-How-To-ChanGe-Name-on-an-United-Airlines/m-p/61945#M6764

https://community.servicetitan.com/t5/General-Office/Just-No-Waiting-How-To-ChanGe-Name-on-a-American-Airlines-Flight/m-p/61828#M6678

https://community.servicetitan.com/t5/General-Office/How-To-ChanGe-Name-on-Frontier-Airlines-Flight-Ticket-Name/m-p/61637#M6559

Yes, passengers can change the Name of their Frontier

https://support.communitybrands.com/hc/en-us/community/posts/30729903619597--Tring-Tring-What-is-Official-Delta-Name-Change-on-Expedia-Call-...