Furmenger/Furminger. It's a Kent/Sussex/Surrey name, and is often spelled Firminger/Firminger etc - I have found dozens of different spellings, some of them one-off typos, but essentially varaitions on F*RM*G*R. The asterisks can represent pretty much any vowel, including Y is early versions, and there may or may not be N before the G (or even instead of it). All of this means that the variants do not appear next to each other in the alphabet, although as far as I know it never starts with PH!
Where and when did the birth take place?
Mean_genie