The interesting thing is Abu Sayyaf is also the name of the Al-Qaeda terrorist group causing trouble in the Philippines.
Rhetorical question - Where do MooSlimes go where they don’t cause trouble?
That may be because the phrase means "bearer of the sword" in Arabic, so in relation to a person it would be more of a street name than a given name, a bit like "Barnabas" was a street name, meaning "son of comfort" in Aramaic, that people in Acts gave to one of the Josephs of the early church.