Do you write Romanov or Romanoff?

[Constantinople]

As the original uses the Cyrillic alphabet, either spelling might be an option. İ was curious who uses which.  İ used to use Romanov but most of the Romanoff family members that İ know use Romanoff.  So İ have switched.  Now İ use Romanoff.

[Sarushka]

I favor literal letter-by-letter transliterations, so I prefer Romanov.

[RomanovsFan4Ever]

I also prefer to write Romanov.

[Constantinople]

Does anyone know where the  ff ending came from?

[Naslednik Norvezhskiy]

Does anyone know where the ff ending came from?

The Russian pronunciation, which is  [rʌˈmanəf], via French.

I favor literal letter-by-letter transliterations, so I prefer Romanov.

Yes, if you adhere to orthographic transliteration, you logically should write Romaneff. That's why I write Romanov.

The funny thing is that while the Germans would pronounce "Romanov" with a v as Romanoff, they spell it as Romanow, pronounced /romanov/. (But Slavic place-names in eastern Germany that end in -ow, e.g. Güstrow, are actually pronounced with the ending /o:/!)

[Sweet_Angel]

I prefer writing Romanov.

[TimM]

I prefer writing Romanov.

Same here

[Constantinople]

Romanov seems to have the lead so far

[Romanov_History_Buff]

Romanov definitely for me! 

[RealAnastasia]

Romanov, no doubt!

RealAnastasia.

[Naslednik Norvezhskiy]

Nobody who writes 罗曼诺夫 ? :-)

Seems like the Chinese prefer the -ff ending, as the last character transliterates as "fu".

[TimM]

Romanov

[Marc]

Romanov...like the Russians themselves use it!

[Kalafrana]

I have a tendency to stick to the first version I came across, unless it is obviously wrong, so Romanov.

[Michael HR]

Romanov for me as well