This below is an Ipsos poll that has already been posted a couple of days ago. It was taken after Spare came out and found that Harry was well-liked by Americans, especially Millennials and Gen Zsers.
An Ipsos poll taken among Americans about a week ago has some interesting data about the BRF.
https://www.ipsos.com/en-us/quarter-americans-say-prince-harry-their-favorite-royal
This poll finds that while about one fifth of Americans believe it would be better if the British monarchy was abolished, a plurality, about two in five, says abolishing the monarchy would make no difference at all. Although, opinions around abolishing the monarchy vary based on perceptions of certain members of the royal family. Americans who favor Duchess Meghan Markle (28%) or Prince Harry (23%), for example, are more likely to say it would be better to abolish the monarchy than those who favor Prince William (13%). Perhaps not surprisingly, Americans who favor King Charles III or do not favor Prince Harry are most likely to say abolishing the monarchy would make things worse (20% for both).
When asked which members of the British royal family they like most, a plurality (25%) of Americans say they like Prince Harry, followed by Princess Kate Middleton (22%), Prince William (17%), Duchess Meghan Markle (12%), and King Charles III (8%). Notably, those against abolishing the monarchy are more likely to say they like Princess Kate Middleton, Prince William, or Prince Charles the most versus those in favor of abolishing the monarchy. Americans who are baby boomers or older are more likely to say they like Prince William or Princess Kate Middleton the most versus Gen Xers or millennials and Gen Zers.
Without making respondents choose between family members, though, nearly the same amount of Americans has a favorable opinion of Prince Harry (41%) versus Prince William (40%). More Americans (47%), however, say they have a favorable perception of Princess Kate Middleton, who also tops favorability for Duchess Meghan Markle (35%) and King Charles III (25%). Of note, baby boomers and older are more likely to have a favorable opinion of Prince William (49%) or Princess Kate Middleton (57%) than Gen Zers and millennials (33% and 43%, respectively). Additionally, Americans with children in their household (53%) are more likely to have a favorable opinion of Prince Harry than those without (35%).