My mum's friend of more than forty years is Nina Kettles, who still lives in Perth, I believe. My mum recently became a Facebook friend, and I noticed that Nina was on her list of friends, so they're still in contact.
I know that "s" probably discounts any familial relationship with the Bridge of Tay Kettles, but you never know, when illiteracy was more common than now, it was all down to which official was filling out your form.
Having said that, there are two distinct McGookin families in Saltcoats, the other lot are not related to us at all.