I was told (a long time ago) that our Hakka family Style of Longfist may well have a 'Chaquan' component within it. Certainly, the movements contained in the clip below are similar - or identical in application - but I think our Longfist is older than the arrival of Arabs in China and it is more likely that these Merchants 'borrowed' from our Style rather than the other way around. It is a matter of working-out the logical 'chain of evidence':
This is a Norhern Style historically associated with the 'Hui' Muslims living in China - the descendants of Arab (Turkic) Merchants who stayed in China and married Chinese women around a thousand years ago. I suspect these men (and their descendants) constructed this Style using common Longfist techniques. This variant is termed 'Yanzhou' - which I assume is a geographical location in Shandong. The name may mean 'Investigate' or 'Learned Fist' (perhaps in the context of 'Knowledgeable Boxing') - depending upon how '查' (cha2) is pronounced. When written as '楂' (cha2) - it refers to a 'wooden raft' - perhaps used in 'travelling' and 'trading'! Finally, although I have no evidence of this myself, I was told that 'Cha' might be a Chinese language transliteration of the (Turkic-Mongolian) term 'Khan'.
Shifu Adrian Chan-Wyles (b. 1967) - Lineage (Generational) Inheritor of the Ch'an Dao Hakka Gongfu System.