The word turjuman

[Figo]

So the word turjumaan in Arabic means guide.
In Somali it means translator
What's a guide in Somali?

 

[Bahal]

Hage

 

[Shamis]

Arabs just documented their language earlier than us. Turjumaan is definitely a Somali word loaned to Arabs - even the meaning 'guide' - a guide to a foreign language is an interpretation.