These characters all contain 各
but the pronunciations are not related to ge or ke.
路 is lù and means 'road'.
络 is luò and means 'net'.
落 is luò and means 'fall'.
骆 Luò is the first character in 骆驼 luòtuo 'camel'.
The element 马 in both of these characters means 'horse'.
Common words including these characters:
走路 zǒulù 'to walk'
联络 liánluò 'get in touch with'
降落 jiàngluò 'to land (of a plane)'