preferably medieval, for your mother’s first husband, if you’re her children by her second husband? If I were you I wouldn’t ask why, because it would take me half a history book and two family trees to explain…
Emma, this question immediately brought to mind one of my favourite words, yclept, which I still haven’t ever managed to use. So I googled it and found this site. Don’t know if it answers the question, but it might help.