Resolving the hostname can always be wrong. but it doesn mean someone logged into your gmail account from that IP.
some phone numbers and names below:
whois 77.42.252.18
% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See
http://www.ripe.net/db/support/db-terms-conditions.pdf
% Note: this output has been filtered.
% To receive output for a database update, use the "-B" flag.
% Information related to '77.42.252.0 - 77.42.252.255'
inetnum: 77.42.252.0 - 77.42.252.255
netname: Libteloccasional2
descr: Libtel occasional2
country: lb
admin-c: AD12345-TC
tech-c: NA12345-GS
status: Assigned PA
mnt-by: toufic-mnt
source: RIPE # Filtered
person: Toufic Chebaro
address: Mina El Hosn Beirut Lebanon
phone: +9611374610
nic-hdl: AD12345-TC
source: RIPE # Filtered
person: Gaby Smayra
address: Mina El Hosn Beirut Lebanon
phone: +9613081349
nic-hdl: NA12345-GS
source: RIPE # Filtered
% Information related to '77.42.252.0/24AS42020'
route: 77.42.252.0/24
descr: Libtel Occasional2
origin: AS42020
mnt-by: toufic-mnt
source: RIPE # Filtered
% Information related to '77.42.248.0/21AS42020'
route: 77.42.248.0/21
descr: Contains subnet for GGC
origin: AS42020
mnt-by: toufic-mnt
source: RIPE # Filtered