In Spain, Portugal and Iberoamerican countries this happens often, since two surnames are used (one for the father, one for the mother). A long name is not a problem. My reference manager is full of Sánchez-Martínez, Prats-Rodríguez, Jiménez-Muñoz, Gómez-Rodríguez and the like.
The main advice in this situation is be consistent in the usage of your name to avoid confusions and that your publications are considered as made by two different authors (e.g. Kinara and Kinara-Williams).
Then you have two options:
- Use your complete name. This decreases the probability of being confounded with another researcher.
- Use one of your names. In this case it may be preferable to use the less common, again to decrease the probability of confusion with another author.