Sometimes udhcpd 1.19.4-vd linux vdlinux.3.1.1. Conects to my wifi and i think someone is stealing wifi?

sometimes "udhcpd 1.19.4-vd linux vdlinux.3.1.1." conects to my wifi and i think someone is stealing my wifi because moments after it connects "johoseps iphone" conects and i would like to block him because my wifi stops working, im a pretty advanced user but i dont know how to really stop him from connecting to my wifi ever again.

Ive been searching what it is online and i cant really figure it out what it is, so i would also like to know exactly what it is, ive understud id had to do with servers.

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